Как правильно пишется символ доллара

«$» redirects here. For the unit of currency, see Dollar. For other uses, see $ (disambiguation).

«Peso sign» redirects here. For the Philippine peso sign «₱», see Philippine peso sign.

$
Dollar sign
Other names	Peso sign
In Unicode	U+0024 $ DOLLAR SIGN ($)
Currency
Currency	Many (see dollar, peso)
Graphical variants
Category

The dollar sign, also known as peso sign, is a symbol consisting of a capital «S» crossed with one or two vertical strokes ($ or depending on typeface), used to indicate the unit of various currencies around the world, including most currencies denominated «peso» and «dollar». The explicitly double-barred sign is called cifrão in Portuguese.

The sign is also used in several compound currency symbols, such as the Brazilian real (R$) and the Nicaraguan córdoba (C$).

The one- and two-stroke version are often considered mere stylistic (typeface) variants, although in some places and epochs one of them may have been specifically assigned, by law or custom, to a specific currency. The Unicode computer encoding standard defines a single code for both.

In most English-speaking countries that use that symbol, it is placed to the left of the amount specified, e.g. «$1», read as «one dollar».

History[edit]

Use for the Spanish American peso in the late 1700s[edit]

The symbol appears in business correspondence in the 1770s from Spanish America, the early independent U.S., British America and Britain, referring to the Spanish American peso,^[1][2] also known as «Spanish dollar» or «piece of eight» in British America. Those coins provided the model for the currency that the United States adopted in 1792, and for the larger coins of the new Spanish American republics, such as the Mexican peso, Argentine peso, Peruvian real, and Bolivian sol coins.

With the Coinage Act of 1792, the United States Congress created the U.S. dollar, defining it to have «the value of a Spanish milled dollar as the same is now current»^[3] but a variety of foreign coins were deemed to be legal tender until the Coinage Act of 1857 ended this status.^{[4][failed verification][5][failed verification]}

The earliest U.S. dollar coins did not have any dollar symbol. The first occurrence in print is claimed to be from 1790s, by a Philadelphia printer Archibald Binny, creator of the Monticello typeface.^[6] The $1 United States Note issued by the United States in 1869 included a large symbol consisting of a «U» with the right bar overlapping an «S» like a single-bar dollar sign, as well as a very small double-stroke dollar sign in the legal warning against forgery.^[7]

Earlier history of the symbol[edit]

It is still uncertain, however, how the dollar sign came to represent the Spanish American peso. There are currently several competing hypotheses:

• One theory holds that the sign grew out of the Spanish and Spanish American scribal abbreviation «p^s» for pesos. A study of late 18th- and early 19th-century manuscripts shows that the s gradually came to be written over the p, developing into a close equivalent to the «$» mark.^{[8][9][10][11][12]} However, there are documents showing the common use of the two-stroke version in Portugal already by 1775.^[13]

• Another hypothesis derives the sign from a depiction of the Pillars of Hercules, a classical symbol for two sides of the Strait of Gibraltar, with a ribbon wrapped around both each pillar (or both pillars) in the form of an «S». This device is common support element of the Spanish coat of arms, and appeared on the most common real de ocho coins circulating at the time in the Americas and Europe; namely, those minted at the Potosí mint in Bolivia, which operated from 1573 to 1825.^[14][10] Indeed, one of the names used for Spanish dollars in Qing Dynasty China was 双柱; 雙柱; shuāngzhù; ‘double-pillar’.^[15]
• A variant of the above theory claims that the sign comes from the mark of the mint at Potosí, where a large portion of the Spanish Empire’s silver was mined, also featured on those coin, which consisted of the letters «P T S I» superimposed. The core of this monogram is a (single-stroked) «$» sign.^[16]

• Yet another hypothesis notes that the English word «dollar» for the Spanish piece of eight originally came (through Dutch daalder) from Joachimsthaler or thaler, a similar large German silver coin which was widely used in Europe. It is therefore conjectured that the dollar sign derived from a symbol consisting of a superimposing S and I or J that was used to denote the German silver coin. Such symbol appears in the 1686 edition of An Introduction to Merchants’ Accounts by John Collins.^[17] Alternatively, the symbol could have come from a snake and cross emblem on the thaler coins.^[6]

Less likely theories[edit]

The following theories seem to have been discredited or contradicted by documentary evidence:

• Some historians have attributed the symbol to Oliver Pollock, a wealthy Irish trader and early supporter of the American Revolution, who used the abbreviation «ps», sometimes run together, in a letter dated 1778.^[6][18]
• In 1937, historian James Alton James claimed that the symbol with two strokes was an adapted design of patriot Robert Morris in 1778, in letters written to Pollock.^[19][20][18]
• In 1939, H. M. Larson suggested that the sign could derive from a combination of the Greek character «psi» (ψ) and «S».^[21]
• Writer Ayn Rand claimed in her 1957 book Atlas Shrugged that the sign started off as a monogram of «US», with a narrow «U» superimposed on the «S», which would have been used on money bags issued by the United States Mint. In her theory, the bottom part of the «U» would have been lost, producing the dollar sign with two vertical lines.^[22][6]
• Authors T. Seijas and J. Frederick noted that the captors of slaves in Spanish territories sometimes branded enslaved people with a symbol very similar to a one-barred dollar sign. Esclavo is Spanish for «slave,» and clavo means nail. A dollar sign is S + clavo.^[14]
• A theory often cited in Portuguese speaking countries is that the «S» part of the doubly-stroked sign is a schematic representation of the path followed by the Umayyad Caliphate general Tariq Ibn Ziyad in his conquest of the Visigoth kingdom in 711 CE, and the two strokes represent the Pillars of Hercules that he would have crossed along that path. That symbol would have been engraved in coins commemorating his victory, and then became symbolic of currency in general.^[23]

Currencies that use the dollar sign[edit]

As symbol of the currency[edit]

The numerous currencies called «dollar» use the dollar sign to express money amounts. The sign is also generally used for the many currencies called «peso» (except the Philippine peso, which uses the symbol «₱»). Within a country the dollar/peso sign may be used alone. In other cases, and to avoid ambiguity in international usage, it is usually combined with other glyphs, e.g. CA$ or Can$ for Canadian dollar.

The dollar sign, alone or in combination with other glyphs, is or was used to denote several currencies with other names, including:

Prefix or suffix[edit]

In the United States, Mexico, Australia, Argentina, New Zealand, Hong Kong, Pacific Island nations, and English-speaking Canada, the sign is written before the number («$5»), even though the word is written or spoken after it («five dollars», «cinco pesos«). In French-speaking Canada, exceptionally, the dollar symbol usually appears after the number,^[24] e.g., «5$». (The cent symbol is written after the number in most countries that use it, e.g., «5¢».)

Use in the Portuguese Empire[edit]

In Portugal, Brazil, and other parts of the Portuguese Empire, the two-stroke variant of the sign (with the name cifrão; (Portuguese pronunciation: [siˈfɾɐ̃w̃] (listen)) was used as the thousands separator of amounts in the national currency, the real (plural «réis», abbreviated «Rs.»): 123500 meant «123500 réis«. This usage is attested in 1775, but may be older by a century or more.^[13] It is always written with two vertical lines: . It is the official sign of the Cape Verdean escudo (ISO 4217: CVE).

In 1911 Portugal redefined the national currency as the escudo, worth 1000 réis, and divided into 100 centavos; but the cifrão continued to be used as the decimal separator,^[25] so that 12350 meant 123.50 escudos or 123 escudos and 50 centavos. This usage ended in 2002 when the country switched to the euro. (A similar scheme to use a letter symbol instead of a decimal point is used by the RKM code in electrical engineering since 1952.)

Cape Verde, a republic and former Portuguese colony, similarly switched from the real to their local escudo and centavos in 1914, and retains the cifrão usage as decimals separator as of 2021. Local versions of the Portuguese escudo were for a time created also for other overseas colonies, including East Timor (1958–1975), Portuguese India (1958–1961), Angola (1914–1928 and 1958–1977), Mozambique (1914–1980), Portuguese Guinea (1914–1975), and São Tomé and Príncipe (1914–1977); presumably^{[clarification needed]} all using the cifrão as decimals separator.^{[citation needed]}

Brazil retained the real and the cifrão as thousands separator until 1942, when it switched to the Brazilian cruzeiro, with comma as the decimals separator. The dollar sign, officially with one stroke but often rendered with two, was retained as part of the currency symbol «Cr $», so one would write Cr$13,50 for 13 cruzeiros and 50 centavos.^[26]

It was formerly used by the Portuguese escudo (ISO: PTE) before its replacement by the euro and by the Portuguese Timor escudo (ISO: TPE) before its replacement by the Indonesian rupiah and the US dollar.^[27] In Portuguese and Cape Verdean usage, the cifrão is placed as a decimal point between the escudo and centavo values.^[28] The name originates in the Arabic sifr (‏صِفْر‎), meaning ‘zero’.^[29]

One stroke vs. two strokes[edit]

In some places and at some times, the one- and two-stroke variants have been used in the same contexts to distinguish between the U.S. dollar and other local currency, such as the former Portuguese escudo.^[25]

However, such usage is not standardized, and furthermore the two versions are generally considered^{[citation needed]} mere graphic variants of the same symbol—a typeface design choice. Computer and typewriter keyboards usually have a single key for that sign, and many character encodings (including ASCII and Unicode) reserve a single numeric code for it. Indeed, dollar signs in the same digital document may be rendered with one or two strokes, if different computer fonts are used. Should that ambiguity be significant, one may use explicit abbreviations (like «US$» or «$NZ»), or ISO 4217 three-letter currency codes (such as USD and MXN) to distinguish different currencies that use the symbol.

When a specific variant is not mandated by law or custom, the choice is usually a matter of expediency or aesthetic preference. Both versions were used in the US in the 18th century. (An 1861 Civil War-era advertisement depicts the two-stroked symbol as a snake.^[18]) The two-stroke version seems to be generally less popular today, though used in some «old-style» fonts like Baskerville.

Use in computer software[edit]

Because of its use in early American computer applications such as business accounting, the dollar sign is almost universally present in computer character sets, and thus has been appropriated for many purposes unrelated to money in programming languages and command languages.

Encoding[edit]

The dollar sign «$» has Unicode code point U+0024 (inherited from ASCII via Latin-1).

• U+0024 $ DOLLAR SIGN ($)^[a]

There are no separate encodings for one- and two-line variants. The choice is typeface-dependent, they are allographs. However, there are three other code points that originate from other East Asian standards: the Taiwanese small form variant, the CJK fullwidth form, and the Japanese emoji. The glyphs for these code points are typically larger or smaller than the primary code point, but the difference is mostly aesthetic or typographic, and the meanings of the symbols are the same.

• U+FE69 ﹩ SMALL DOLLAR SIGN
• U+FF04 ＄ FULLWIDTH DOLLAR SIGN
• U+1F4B2 💲 HEAVY DOLLAR SIGN

However, for usage as the special character in various computing applications (see following sections), U+0024 is typically the only code that is recognized.

Support for the two-line variant varies. As of 2019, the Unicode standard considers the distinction between one- and two-bar dollar signs a stylistic distinction between fonts, and has no separate code point for the cifrão. The symbol is not in the October 2019 ‘pipeline’,^[32] but appears to be under active consideration.^[33]

The following fonts display a double-bar dollar sign for code point 0024:^{[citation needed]} regular-weight Baskerville, Big Caslon, Bodoni MT, Bradley Hand ITC, Brush Script MT, Garamond, STFangsong, STKaiti, and STSong ($).

In LaTeX, with the textcomp package installed, the cifrão () can be input using the command textdollaroldstyle.

However, because of font substitution and the lack of a dedicated code point, the author of an electronic document who uses one of these fonts intending to represent a cifrão cannot be sure that every reader will see a double-bar glyph rather than the single barred version.

Because of the continued lack of support in Unicode, a single bar dollar sign is frequently employed in its place even for official purposes.^[28][34] Where there is any risk of misunderstanding, the ISO 4217 three letter acronym is used.

Programming languages[edit]

• $ was used for defining string variables in older versions of the BASIC language, e.g. CHR$ ($ was often pronounced «string» instead of «dollar» in this use).
• $ is prefixed to names to define variables in the PHP language and the AutoIt automation script language, scalar variables in the Perl language (see sigil (computer programming)), and global variables in the Ruby language. In Perl programming this includes scalar elements of arrays $array[7] and hashes $hash{foo}.
• In most shell scripting languages, $ is used to indicate the insertion into strings of environment variables, special variables, input data fields, previous commands, arithmetic computations, and special characters, and for performing translation of localised strings. In the shell script languages of CP/M, DOS, and several Unix-like systems, it is used to insert variable information (such as the current working directory, user name, or sequential command number) in the command prompt.
• $ is used for defining hexadecimal constants in Pascal-like languages such as Delphi, and in some variants of assembly language.
• $ is used in the ALGOL 68 language to delimit transput format regions.
• $ is used in the TeX typesetting language to delimit mathematical regions.
• In many versions of FORTRAN 66, $ could be used as an alternative to a quotation mark for delimiting strings.
• In PL/M, $ can be used to put a visible separation between words in compound identifiers. For example, Some$Name refers to the same thing as ‘SomeName’.
• In Haskell, $ is used as a function application operator.
• In an AutoHotkey script, a hotkey declared with $ is not triggered by a ‘Send’ command elsewhere in the script.
• In several JavaScript frameworks such as Prototype.js and jQuery, $ is a common utility class, and is often referred to as the buck.^{[citation needed]} Otherwise, it’s a character allowed in identifiers.
• In JavaScript from ES6 onward it is used inside template literals to insert the value of a variable. For example, if var word = "such" then `as ${word}` would equal 'as such'
• In C#, $ marks a string literal as an interpolated string.
• In ASP.NET, the dollar sign used in a tag in the web page indicates an expression will follow it. The expression that follows is .NET language-agnostic, as it will work with C#, VB.NET, or any CLR supported language.
• In Erlang, the dollar sign precedes character literals. The dollar sign as a character can be written $$.
• In COBOL the $ sign is used in the Picture clause to depict a floating currency symbol as the left most character. The default symbol is $; however, if the CURRENCY= or CURRENCY SIGN clause is specified, many other symbols can be used.
• In some assembly languages, such as MIPS, the $ sign is used to represent registers.
• In Honeywell 6000 series assembler, the $ sign, when used as an address, meant the address of the instruction in which it appeared.
• In CMS-2, the $ sign is used as a statement terminator.
• In R, the $ sign is used as a subsetting operator.
• In Q (programming language from Kx Systems), the $ sign is used as a casting/padding/enumeration/conditional operator.
• In Sass, the $ sign is prefixed to define a variable.

Operating systems[edit]

• In CP/M and subsequently in all versions of DOS (86-DOS, MS-DOS, PC DOS, more) and derivatives, $ is used as a string terminator (Int 21h with AH=09h).
• In Microsoft Windows, $ is appended to the share name to hide a shared folder or resource. For example, \servershare will be visible to other computers on a network, while \servershare$ will be accessible only by explicit reference. Hiding a shared folder or resource will not alter its access permissions but may render it inaccessible to programs or other functions which rely on its visibility. Most administrative shares are hidden in this way.
• In the LDAP directory access protocol, $ is used as a line separator in various standard entry attributes such as postalAddress.
• In the UNIVAC EXEC 8 operating system, $ means «system». It is appended to entities such as the names of system files, the «sender» name in messages sent by the operator, and the default names of system-created files (like compiler output) when no specific name is specified (e.g., TPF$, NAME$, etc.)
• In RISC OS, $ is used in system variables to separate the application name from the variables specific to that application. For example Draw$Dir specifies the directory where the !Draw application is located. It is also used to refer to the root directory of a file system.

Applications[edit]

• Microsoft Excel^[35] and other spreadsheet software use the dollar sign ($) to denote a fixed row, fixed column reference, or an absolute cell reference.
• The dollar sign introduces a subfield delimiter in computer coding of library catalog records.
• $ matches the end of a line or string in sed, grep, and POSIX and Perl regular expressions, as well as the end of a line or the file in text editors ed, ex, vi, pico, and derivatives.

Other uses[edit]

The symbol is sometimes used derisively, in place of the letter S, to indicate greed or excess money such as in «Micro$oft», «Di$ney», «Chel$ea» and «GW$»; or supposed overt Americanisation as in «$ky». The dollar sign is also used intentionally to stylize names such as A$AP Rocky, Ke$ha, and Ty Dolla $ign or words such as ¥€$. In 1872, Ambrose Bierce referred to California governor Leland Stanford as $tealand Landford.^[36]

In Scrabble notation, a dollar sign is placed after a word to indicate that it is valid according to the North American word lists, but not according to the British word lists.^[37]

A dollar symbol is used as unit of reactivity for a nuclear reactor, 0 $ being the threshold of slow criticality, meaning a steady reaction rate, while 1 $ is the threshold of prompt criticality, which means a nuclear excursion or explosion.^[38][39]

The dollar sign was used as a letter in the Turkmen alphabet from 1993 to 1999.^{[citation needed]}

The dollar sign plays an important role in the plot of Ayn Rand’s novel Atlas Shrugged, with the book’s radical Free Market activists adopting it as their insignia.^{[citation needed]}

See also[edit]

• Cifrão
• Euro sign
• Indian rupee sign
• Pound sign
• Ruble sign
• Rupee sign
• Spanish dollar
• Turkish lira sign
• Yen sign
• Yuan sign
• Won sign

Explanatory notes[edit]

References[edit]

Citations[edit]

General and cited sources[edit]

External links[edit]

• Media related to Dollar sign at Wikimedia Commons

«$» redirects here. For the unit of currency, see Dollar. For other uses, see $ (disambiguation).

«Peso sign» redirects here. For the Philippine peso sign «₱», see Philippine peso sign.

$
Dollar sign
Other names	Peso sign
In Unicode	U+0024 $ DOLLAR SIGN ($)
Currency
Currency	Many (see dollar, peso)
Graphical variants
Category

The dollar sign, also known as peso sign, is a symbol consisting of a capital «S» crossed with one or two vertical strokes ($ or depending on typeface), used to indicate the unit of various currencies around the world, including most currencies denominated «peso» and «dollar». The explicitly double-barred sign is called cifrão in Portuguese.

The sign is also used in several compound currency symbols, such as the Brazilian real (R$) and the Nicaraguan córdoba (C$).

The one- and two-stroke version are often considered mere stylistic (typeface) variants, although in some places and epochs one of them may have been specifically assigned, by law or custom, to a specific currency. The Unicode computer encoding standard defines a single code for both.

In most English-speaking countries that use that symbol, it is placed to the left of the amount specified, e.g. «$1», read as «one dollar».

History[edit]

Use for the Spanish American peso in the late 1700s[edit]

The symbol appears in business correspondence in the 1770s from Spanish America, the early independent U.S., British America and Britain, referring to the Spanish American peso,^[1][2] also known as «Spanish dollar» or «piece of eight» in British America. Those coins provided the model for the currency that the United States adopted in 1792, and for the larger coins of the new Spanish American republics, such as the Mexican peso, Argentine peso, Peruvian real, and Bolivian sol coins.

With the Coinage Act of 1792, the United States Congress created the U.S. dollar, defining it to have «the value of a Spanish milled dollar as the same is now current»^[3] but a variety of foreign coins were deemed to be legal tender until the Coinage Act of 1857 ended this status.^{[4][failed verification][5][failed verification]}

The earliest U.S. dollar coins did not have any dollar symbol. The first occurrence in print is claimed to be from 1790s, by a Philadelphia printer Archibald Binny, creator of the Monticello typeface.^[6] The $1 United States Note issued by the United States in 1869 included a large symbol consisting of a «U» with the right bar overlapping an «S» like a single-bar dollar sign, as well as a very small double-stroke dollar sign in the legal warning against forgery.^[7]

Earlier history of the symbol[edit]

It is still uncertain, however, how the dollar sign came to represent the Spanish American peso. There are currently several competing hypotheses:

• One theory holds that the sign grew out of the Spanish and Spanish American scribal abbreviation «p^s» for pesos. A study of late 18th- and early 19th-century manuscripts shows that the s gradually came to be written over the p, developing into a close equivalent to the «$» mark.^{[8][9][10][11][12]} However, there are documents showing the common use of the two-stroke version in Portugal already by 1775.^[13]

• Another hypothesis derives the sign from a depiction of the Pillars of Hercules, a classical symbol for two sides of the Strait of Gibraltar, with a ribbon wrapped around both each pillar (or both pillars) in the form of an «S». This device is common support element of the Spanish coat of arms, and appeared on the most common real de ocho coins circulating at the time in the Americas and Europe; namely, those minted at the Potosí mint in Bolivia, which operated from 1573 to 1825.^[14][10] Indeed, one of the names used for Spanish dollars in Qing Dynasty China was 双柱; 雙柱; shuāngzhù; ‘double-pillar’.^[15]
• A variant of the above theory claims that the sign comes from the mark of the mint at Potosí, where a large portion of the Spanish Empire’s silver was mined, also featured on those coin, which consisted of the letters «P T S I» superimposed. The core of this monogram is a (single-stroked) «$» sign.^[16]

• Yet another hypothesis notes that the English word «dollar» for the Spanish piece of eight originally came (through Dutch daalder) from Joachimsthaler or thaler, a similar large German silver coin which was widely used in Europe. It is therefore conjectured that the dollar sign derived from a symbol consisting of a superimposing S and I or J that was used to denote the German silver coin. Such symbol appears in the 1686 edition of An Introduction to Merchants’ Accounts by John Collins.^[17] Alternatively, the symbol could have come from a snake and cross emblem on the thaler coins.^[6]

Less likely theories[edit]

The following theories seem to have been discredited or contradicted by documentary evidence:

• Some historians have attributed the symbol to Oliver Pollock, a wealthy Irish trader and early supporter of the American Revolution, who used the abbreviation «ps», sometimes run together, in a letter dated 1778.^[6][18]
• In 1937, historian James Alton James claimed that the symbol with two strokes was an adapted design of patriot Robert Morris in 1778, in letters written to Pollock.^[19][20][18]
• In 1939, H. M. Larson suggested that the sign could derive from a combination of the Greek character «psi» (ψ) and «S».^[21]
• Writer Ayn Rand claimed in her 1957 book Atlas Shrugged that the sign started off as a monogram of «US», with a narrow «U» superimposed on the «S», which would have been used on money bags issued by the United States Mint. In her theory, the bottom part of the «U» would have been lost, producing the dollar sign with two vertical lines.^[22][6]
• Authors T. Seijas and J. Frederick noted that the captors of slaves in Spanish territories sometimes branded enslaved people with a symbol very similar to a one-barred dollar sign. Esclavo is Spanish for «slave,» and clavo means nail. A dollar sign is S + clavo.^[14]
• A theory often cited in Portuguese speaking countries is that the «S» part of the doubly-stroked sign is a schematic representation of the path followed by the Umayyad Caliphate general Tariq Ibn Ziyad in his conquest of the Visigoth kingdom in 711 CE, and the two strokes represent the Pillars of Hercules that he would have crossed along that path. That symbol would have been engraved in coins commemorating his victory, and then became symbolic of currency in general.^[23]

Currencies that use the dollar sign[edit]

As symbol of the currency[edit]

The numerous currencies called «dollar» use the dollar sign to express money amounts. The sign is also generally used for the many currencies called «peso» (except the Philippine peso, which uses the symbol «₱»). Within a country the dollar/peso sign may be used alone. In other cases, and to avoid ambiguity in international usage, it is usually combined with other glyphs, e.g. CA$ or Can$ for Canadian dollar.

The dollar sign, alone or in combination with other glyphs, is or was used to denote several currencies with other names, including:

Prefix or suffix[edit]

In the United States, Mexico, Australia, Argentina, New Zealand, Hong Kong, Pacific Island nations, and English-speaking Canada, the sign is written before the number («$5»), even though the word is written or spoken after it («five dollars», «cinco pesos«). In French-speaking Canada, exceptionally, the dollar symbol usually appears after the number,^[24] e.g., «5$». (The cent symbol is written after the number in most countries that use it, e.g., «5¢».)

Use in the Portuguese Empire[edit]

In Portugal, Brazil, and other parts of the Portuguese Empire, the two-stroke variant of the sign (with the name cifrão; (Portuguese pronunciation: [siˈfɾɐ̃w̃] (listen)) was used as the thousands separator of amounts in the national currency, the real (plural «réis», abbreviated «Rs.»): 123500 meant «123500 réis«. This usage is attested in 1775, but may be older by a century or more.^[13] It is always written with two vertical lines: . It is the official sign of the Cape Verdean escudo (ISO 4217: CVE).

In 1911 Portugal redefined the national currency as the escudo, worth 1000 réis, and divided into 100 centavos; but the cifrão continued to be used as the decimal separator,^[25] so that 12350 meant 123.50 escudos or 123 escudos and 50 centavos. This usage ended in 2002 when the country switched to the euro. (A similar scheme to use a letter symbol instead of a decimal point is used by the RKM code in electrical engineering since 1952.)

Cape Verde, a republic and former Portuguese colony, similarly switched from the real to their local escudo and centavos in 1914, and retains the cifrão usage as decimals separator as of 2021. Local versions of the Portuguese escudo were for a time created also for other overseas colonies, including East Timor (1958–1975), Portuguese India (1958–1961), Angola (1914–1928 and 1958–1977), Mozambique (1914–1980), Portuguese Guinea (1914–1975), and São Tomé and Príncipe (1914–1977); presumably^{[clarification needed]} all using the cifrão as decimals separator.^{[citation needed]}

Brazil retained the real and the cifrão as thousands separator until 1942, when it switched to the Brazilian cruzeiro, with comma as the decimals separator. The dollar sign, officially with one stroke but often rendered with two, was retained as part of the currency symbol «Cr $», so one would write Cr$13,50 for 13 cruzeiros and 50 centavos.^[26]

It was formerly used by the Portuguese escudo (ISO: PTE) before its replacement by the euro and by the Portuguese Timor escudo (ISO: TPE) before its replacement by the Indonesian rupiah and the US dollar.^[27] In Portuguese and Cape Verdean usage, the cifrão is placed as a decimal point between the escudo and centavo values.^[28] The name originates in the Arabic sifr (‏صِفْر‎), meaning ‘zero’.^[29]

One stroke vs. two strokes[edit]

In some places and at some times, the one- and two-stroke variants have been used in the same contexts to distinguish between the U.S. dollar and other local currency, such as the former Portuguese escudo.^[25]

However, such usage is not standardized, and furthermore the two versions are generally considered^{[citation needed]} mere graphic variants of the same symbol—a typeface design choice. Computer and typewriter keyboards usually have a single key for that sign, and many character encodings (including ASCII and Unicode) reserve a single numeric code for it. Indeed, dollar signs in the same digital document may be rendered with one or two strokes, if different computer fonts are used. Should that ambiguity be significant, one may use explicit abbreviations (like «US$» or «$NZ»), or ISO 4217 three-letter currency codes (such as USD and MXN) to distinguish different currencies that use the symbol.

When a specific variant is not mandated by law or custom, the choice is usually a matter of expediency or aesthetic preference. Both versions were used in the US in the 18th century. (An 1861 Civil War-era advertisement depicts the two-stroked symbol as a snake.^[18]) The two-stroke version seems to be generally less popular today, though used in some «old-style» fonts like Baskerville.

Use in computer software[edit]

Because of its use in early American computer applications such as business accounting, the dollar sign is almost universally present in computer character sets, and thus has been appropriated for many purposes unrelated to money in programming languages and command languages.

Encoding[edit]

The dollar sign «$» has Unicode code point U+0024 (inherited from ASCII via Latin-1).

• U+0024 $ DOLLAR SIGN ($)^[a]

There are no separate encodings for one- and two-line variants. The choice is typeface-dependent, they are allographs. However, there are three other code points that originate from other East Asian standards: the Taiwanese small form variant, the CJK fullwidth form, and the Japanese emoji. The glyphs for these code points are typically larger or smaller than the primary code point, but the difference is mostly aesthetic or typographic, and the meanings of the symbols are the same.

• U+FE69 ﹩ SMALL DOLLAR SIGN
• U+FF04 ＄ FULLWIDTH DOLLAR SIGN
• U+1F4B2 💲 HEAVY DOLLAR SIGN

However, for usage as the special character in various computing applications (see following sections), U+0024 is typically the only code that is recognized.

Support for the two-line variant varies. As of 2019, the Unicode standard considers the distinction between one- and two-bar dollar signs a stylistic distinction between fonts, and has no separate code point for the cifrão. The symbol is not in the October 2019 ‘pipeline’,^[32] but appears to be under active consideration.^[33]

The following fonts display a double-bar dollar sign for code point 0024:^{[citation needed]} regular-weight Baskerville, Big Caslon, Bodoni MT, Bradley Hand ITC, Brush Script MT, Garamond, STFangsong, STKaiti, and STSong ($).

In LaTeX, with the textcomp package installed, the cifrão () can be input using the command textdollaroldstyle.

However, because of font substitution and the lack of a dedicated code point, the author of an electronic document who uses one of these fonts intending to represent a cifrão cannot be sure that every reader will see a double-bar glyph rather than the single barred version.

Because of the continued lack of support in Unicode, a single bar dollar sign is frequently employed in its place even for official purposes.^[28][34] Where there is any risk of misunderstanding, the ISO 4217 three letter acronym is used.

Programming languages[edit]

• $ was used for defining string variables in older versions of the BASIC language, e.g. CHR$ ($ was often pronounced «string» instead of «dollar» in this use).
• $ is prefixed to names to define variables in the PHP language and the AutoIt automation script language, scalar variables in the Perl language (see sigil (computer programming)), and global variables in the Ruby language. In Perl programming this includes scalar elements of arrays $array[7] and hashes $hash{foo}.
• In most shell scripting languages, $ is used to indicate the insertion into strings of environment variables, special variables, input data fields, previous commands, arithmetic computations, and special characters, and for performing translation of localised strings. In the shell script languages of CP/M, DOS, and several Unix-like systems, it is used to insert variable information (such as the current working directory, user name, or sequential command number) in the command prompt.
• $ is used for defining hexadecimal constants in Pascal-like languages such as Delphi, and in some variants of assembly language.
• $ is used in the ALGOL 68 language to delimit transput format regions.
• $ is used in the TeX typesetting language to delimit mathematical regions.
• In many versions of FORTRAN 66, $ could be used as an alternative to a quotation mark for delimiting strings.
• In PL/M, $ can be used to put a visible separation between words in compound identifiers. For example, Some$Name refers to the same thing as ‘SomeName’.
• In Haskell, $ is used as a function application operator.
• In an AutoHotkey script, a hotkey declared with $ is not triggered by a ‘Send’ command elsewhere in the script.
• In several JavaScript frameworks such as Prototype.js and jQuery, $ is a common utility class, and is often referred to as the buck.^{[citation needed]} Otherwise, it’s a character allowed in identifiers.
• In JavaScript from ES6 onward it is used inside template literals to insert the value of a variable. For example, if var word = "such" then `as ${word}` would equal 'as such'
• In C#, $ marks a string literal as an interpolated string.
• In ASP.NET, the dollar sign used in a tag in the web page indicates an expression will follow it. The expression that follows is .NET language-agnostic, as it will work with C#, VB.NET, or any CLR supported language.
• In Erlang, the dollar sign precedes character literals. The dollar sign as a character can be written $$.
• In COBOL the $ sign is used in the Picture clause to depict a floating currency symbol as the left most character. The default symbol is $; however, if the CURRENCY= or CURRENCY SIGN clause is specified, many other symbols can be used.
• In some assembly languages, such as MIPS, the $ sign is used to represent registers.
• In Honeywell 6000 series assembler, the $ sign, when used as an address, meant the address of the instruction in which it appeared.
• In CMS-2, the $ sign is used as a statement terminator.
• In R, the $ sign is used as a subsetting operator.
• In Q (programming language from Kx Systems), the $ sign is used as a casting/padding/enumeration/conditional operator.
• In Sass, the $ sign is prefixed to define a variable.

Operating systems[edit]

• In CP/M and subsequently in all versions of DOS (86-DOS, MS-DOS, PC DOS, more) and derivatives, $ is used as a string terminator (Int 21h with AH=09h).
• In Microsoft Windows, $ is appended to the share name to hide a shared folder or resource. For example, \servershare will be visible to other computers on a network, while \servershare$ will be accessible only by explicit reference. Hiding a shared folder or resource will not alter its access permissions but may render it inaccessible to programs or other functions which rely on its visibility. Most administrative shares are hidden in this way.
• In the LDAP directory access protocol, $ is used as a line separator in various standard entry attributes such as postalAddress.
• In the UNIVAC EXEC 8 operating system, $ means «system». It is appended to entities such as the names of system files, the «sender» name in messages sent by the operator, and the default names of system-created files (like compiler output) when no specific name is specified (e.g., TPF$, NAME$, etc.)
• In RISC OS, $ is used in system variables to separate the application name from the variables specific to that application. For example Draw$Dir specifies the directory where the !Draw application is located. It is also used to refer to the root directory of a file system.

Applications[edit]

• Microsoft Excel^[35] and other spreadsheet software use the dollar sign ($) to denote a fixed row, fixed column reference, or an absolute cell reference.
• The dollar sign introduces a subfield delimiter in computer coding of library catalog records.
• $ matches the end of a line or string in sed, grep, and POSIX and Perl regular expressions, as well as the end of a line or the file in text editors ed, ex, vi, pico, and derivatives.

Other uses[edit]

The symbol is sometimes used derisively, in place of the letter S, to indicate greed or excess money such as in «Micro$oft», «Di$ney», «Chel$ea» and «GW$»; or supposed overt Americanisation as in «$ky». The dollar sign is also used intentionally to stylize names such as A$AP Rocky, Ke$ha, and Ty Dolla $ign or words such as ¥€$. In 1872, Ambrose Bierce referred to California governor Leland Stanford as $tealand Landford.^[36]

In Scrabble notation, a dollar sign is placed after a word to indicate that it is valid according to the North American word lists, but not according to the British word lists.^[37]

A dollar symbol is used as unit of reactivity for a nuclear reactor, 0 $ being the threshold of slow criticality, meaning a steady reaction rate, while 1 $ is the threshold of prompt criticality, which means a nuclear excursion or explosion.^[38][39]

The dollar sign was used as a letter in the Turkmen alphabet from 1993 to 1999.^{[citation needed]}

The dollar sign plays an important role in the plot of Ayn Rand’s novel Atlas Shrugged, with the book’s radical Free Market activists adopting it as their insignia.^{[citation needed]}

See also[edit]

• Cifrão
• Euro sign
• Indian rupee sign
• Pound sign
• Ruble sign
• Rupee sign
• Spanish dollar
• Turkish lira sign
• Yen sign
• Yuan sign
• Won sign

Explanatory notes[edit]

References[edit]

Citations[edit]

General and cited sources[edit]

External links[edit]

• Media related to Dollar sign at Wikimedia Commons

Давайте раз и навсегда закроем вопрос о том, как правильно писать валюты.

Вот рубль по-русски можно написать такими вариантами: руб., р., ₽, RUB, RUR.

А вот варианты с долларами: доллары, $, USD.

Так какой вариант выбрать? А как писать: в начале или в конце? А пробел нужен?

Лебедев в своем «Ководстве» пишет:

Так же он отмечает:

Илья Бирман с этим не согласился.

Потом, однако, признал в этом свою неправоту.

Есть очень много ясности в вопросах использования. И много темных мест.

Однозначные символы: $, ¥, ₽, €, ₣, £, ₩,…

Это все типографские символы. Лигатуры. Они входят в Стандарт Юникод, но не стандартизированы в ISO по правилам их использования.

Символы валют очень популярны, вы встретите их везде: на ценниках, в банковских приложениях, в общих и тематических статьях.

Однозначные символы нативны. Часто, они изображены на самих купюрах. Люди их быстро узнают и легко считывают. А значок доллара вообще равен значку денег.

Много, однако, неясностей.

Где писать?

Непонятно где их ставить, в начале или в конце? Лебедев топит за то, что нужно писать в конце, якобы в России у нас так. А если это международный сервис? Например, интернет-магазин, локализованный на разных языках. На русском писать так, а на английском по-другому?

Пробел нужен?

В США пишут без пробела $100 (хотя тоже не всегда). У нас символ ₽ намекает на то, что это единица изменения, хотя это спорно. По системе СИ единица изменения пишется через пробел и точка в конце не ставится.

Чей доллар?

Мало кто знает, но доллар – это название валюты очень многих стран. Не только США. Есть например, австралийский доллар, канадский, либерийский, доллар Намибии и еще пару десятков стран. Все они обозначаются символом $.

А еще есть аргентинское песо, боливийский боливиано, бразильский реал, кабо-вердийский эскудо и еще много валют, которые вообще не доллары, но обозначаются значком $.

Как тут быть, если в одной системе я использую сразу несколько из этих валют? Как их различать между собой?

Боливиец живет в своей стране, заходит в магазин, видит ценники и понимает, что условно, хлеб за 10 $ – это значит хлеб за десять боливийский боливиано.

А что случается, когда он заходит на брокерскую биржу, где целая система разных международных валют?

Символ?

Вообще не у всех валют есть однозначные символы. Их очень мало. Все, что есть в заголовке этого раздела и еще пару символов, этим наверное и ограничится. Если вы знаете еще какие-нибудь символы, напишите, пожалуйста, в комментарии.

Большая часть валют вообще не использует лигатуры: арабский дирхам, бахрейнский динар, белорусский рубль, венгерский форинт.

А даже если есть, то не факт, что они будут в Юникоде. А даже если есть в Юникоде, то не факт, что они будут в гарнитуре, которую вы используете в своем проекте. Попробуйте, например в Фигме ввести символ армянского драма ֏ на разных гарнитурах.

Как вводить?

На Windows все зависит от клавиатуры, с которой вы вводите. На клавиатуре Apple с русской раскладкой символ ₽ доступен по Alt + р.

Значок доллара тоже $ доступен, но не просто. На Mac OS, например нужно переключиться на английскую раскладку и потом Shift + 4. Со значком евро еще сложнее: на английской раскладке Shif + Alt + 4.

Остальные символы не доступны на клавиатурах, поэтому их придется гуглить.

Многозначные коды: USD, RUB, BTC, ETH, …

Коды валют стандартизированы в ISO 4217 и все они трехзначные. Вроде все круто, есть международный стандарт, будем его придерживаться. Но и здесь есть непонятные места.

Проблема в том, что этот стандарт не учитывает валюты непризнанных государств, типа приднестровского рубля RUP или абхазского апсара LTU. А в целом на этой можно закрыть глаза

Так же в этом стандарте нет криптовалют. Тоже можно закрыть глаза. Но криптовалют много. На сегодняшний день их более 18-ти тысяч, а количество комбинаций их трехзначных символов латинского алфавита составляет 17576. Поэтому очень много криптовалют используют четыре знака: FLOW, USDT, MANA, NEXO.

Где писать?

Все просто. Стандарт ISO 4217 не регламентирует с какой стороны от числа нужно писать код валюты, мол, придерживайтесь тех традиций, которые установлены в вашей системе.

Пробел?

Пробел точно ставится в любом случае.

Сокращения: руб., р., дол., …

В сокращенной англоязычной культуре не приняты сокращения (хотя раньше сокращали).

В России мы чаще всего видим именно сокращения р. или руб. вместо ₽.

Пробел и точка?

Пробел в русском языке обязательно.

Точка нужна, так как это не единица измерения, а сокращение слова «рубль».

Решение

Решение опубликую завтра утром. А пока что подпишитесь, пожалуйста на мой телеграм-канал.

$
Знак доллара
Другие названия	Знак песо
В Unicode	U +0024 $ ДОЛЛАР ЗНАК (HTML $·$)
Валюта
Валюта	много (см. доллар, песо )
Графические варианты
Категория

Знак знак доллара или знак песо ($или ) — это символ , используемый для обозначения единиц различных валют по всему миру, в частности, большинство валют, деноминированных в песо и долларах. Символ может иметь один или два вертикальных штриха взаимозаменяемо. Обычно этот знак отображается слева от указанная сумма, например «1 доллар», читается как «один доллар».

Содержание

• 1 Источник
  • 1.1 Отрисовано двумя вертикальными линиями
• 2 Использование в компьютерном программном обеспечении
  • 2.1 Кодирование
  • 2.2 Языки программирования
  • 2.3 Операционные системы
  • 2.4 Приложения
• 3 Валюты, в которых используется знак доллара или песо
  • 3.1 В играх и виртуальных мирах
• 4 Другое использование
• 5 См. Также
• 6 Примечания
• 7 Источники

Происхождение

Развитие знака доллара согласно наиболее документированной гипотезе (вверху) и одной альтернативной гипотезе (внизу)

Существует несколько гипотез о происхождении знак доллара. Впервые он засвидетельствован в испанско-американской, американской, канадской, мексиканской и другой британской деловой переписке в 1770-х годах и относится к испанскому американскому песо, также известному в Америке как «испанский доллар » или «кусок восьмерки», который предоставил модель валюты, принятой в США в 1792 году, и более крупных монет новых испанских американских республик, таких как мексиканское песо, перуанский реал и Боливийский соль монет. Это объяснение гласит, что знак вырос из испанской и испанско-американской письменной аббревиатуры «pˢ» для песо. Изучение рукописей конца восемнадцатого и начала девятнадцатого веков показывает, что s постепенно стали писать поверх p, превращаясь в близкий эквивалент знака «$». Разновидность этой гипотезы выводит знак из комбинации греческого символа «psi» (ψ) и «S».

В соответствии с Законом о чеканке монет 1792 года, Конгресс Соединенных Штатов создал доллар США, определив, что он имеет «стоимость испанского мельничного доллара, как он сейчас», но продолжал использовать различные иностранные монеты до Закона о чеканке 1857 г. объявил их незаконными. На этих монетах в виде доллара США не было символа доллара.

Мексика продолжала использовать испанский доллар до тех пор, пока не закончилась мексиканская война за независимость.

Нарисовано двумя вертикальными линиями

Несколько альтернативных гипотез относятся именно к знаку доллара, нарисованному двумя вертикальными линиями. линий. Знак доллара с двумя вертикальными линиями мог начаться как монограмма «США» на мешках с деньгами, выпущенных Монетным двором США. Наложенные друг на друга буквы U и S напоминают исторический двухстрочный знак доллара . Нижняя часть буквы U исчезает в нижней кривой буквы S, оставляя две вертикальные линии. Доктор Джеймс Альтон Джеймс был профессором истории Северо-Западного университета с 1897 по 1935 год, и он предположил, что символ с двумя штрихами был адаптированным дизайном патриота Роберта Морриса 1778 года.

Банкнота США $ 1, выпущенная Соединенными Штатами в 1869 году, включала символ, состоящий из частично перекрывающихся U и S, с одной из полосок U, пересекающих S, а также двойного символа доллара. подпишите юридическое предупреждение против подделки. Другая гипотеза состоит в том, что он произошел от символа, использованного на немецком Thaler. Подобный символ наложения S и I или J использовался для обозначения немецкого Joachimsthaler, который появился в издании 1686 года An Introduction to Merchants ‘Accounts John Collins.

Use in computer software

Из-за его использования в ранних американских компьютерных приложениях, таких как бухгалтерский учет, знак доллара почти повсеместно присутствует в компьютерных наборах символов и, таким образом, использовался для многих целей, не связанных с деньгами в языки программирования и языки команд.

Кодировка

Знак доллара «$» имеет кодовую точку Unicode U + 0024 (унаследованную от ASCII через Latin-1 ).

• U+ 0024 $ ЗНАК ДОЛЛАРА (HTML $·$) ($в HTML5)

Нет отдельных кодировок для одно- и двухстрочных варианты. Выбор зависит от гарнитуры, это аллографы.

. Есть также три других кодовых точки, которые происходят из других восточноазиатских стандартов: тайваньский вариант малой формы, полноширинная форма CJK и японский эмодзи. Глифы для этих кодовых точек обычно больше или меньше основной кодовой точки, но разница в основном эстетическая или типографская, а значения символов одинаковы.

• U+ FE69 ﹩ МАЛЫЙ ЗНАК ДОЛЛАРА (HTML ﹩)
• U+ FF04 ＄ ПОЛНОШИРНЫЙ ЗНАК ДОЛЛАРА (HTML ＄)
• U+ 1F4B2 💲 ЗНАК ТЯЖЕЛЫЙ ДОЛЛАР (HTML 💲)

Однако для использования в качестве специального символа в различных вычислительных приложениях (см. Следующие разделы), U + 0024, как правило, является единственным распознаваемым кодом.

Языки программирования

• $ использовались для определения string переменные в более старых версиях языка BASIC, например, CHR $ («$» в этом случае часто произносилось как «строка» вместо «доллар»
• $ используется для определения шестнадцатеричных констант в Pascal -подобных языках, таких как Delphi, и в некоторых вариантах языка ассемблера.
• $ добавляется к именам для определения переменных на языке PHP и языка сценариев автоматизации AutoIt, скалярных переменных в Perl язык (см. сигил (компьютерное программирование) ) и глобальные переменные на языке Ruby. В программировании на Perl t он включает скалярные элементы массивов $ array [7] и хэшей $hash{foo}.
• В большинстве языков сценариев оболочки $ используется для интерполяции (s ubstitution of) переменных среды, специальных переменных, арифметических вычислений и специальных символов, а также для выполнения перевода локализованных строк. Кристофер Стрэтчи GPM, вдохновитель для Multics оболочки, использовал не- ASCII символ § для макроса
• $ используется в языке ALGOL 68 для разграничения областей формата передачи.
• $ используется в TeX наборный язык для разграничения математических областей.
• Во многих версиях FORTRAN 66 знак $ может использоваться как альтернатива кавычкам для разграничения строк.
• В PL / M, $ можно использовать для визуального разделения слов в составных идентификаторах. Например, «Some $ Name» означает то же, что и «SomeName».
• В Haskell $ используется как оператор приложения-функции.
• В AutoHotkey сценарий, горячая клавиша, объявленная с помощью $, не запускается командой «Отправить» где-либо еще в сценарии.
• В некоторых фреймворках JavaScript, таких как Prototype.js и jQuery, $ является обычным и часто упоминается как доллар.
• В JavaScript, начиная с ES6, он используется внутри шаблона литералы для вставки значения переменной. Например, если var word = «such», то ʻas $ {word} `будет равно ‘as such’
• В C #, $ помечает строковый литерал как интерполированный string.
• В ASP.NET знак доллара, используемый в теге на веб-странице, указывает, что выражение будет следовать за ним. Следующее выражение -.NET не зависящее от языка, так как оно будет работать с C #, vb.net или любым языком, поддерживаемым CLR.
• В Erlang Знак доллара предшествует символьным литералам. Знак доллара в виде символа может быть записан в виде $$.
• В COBOL знак $ используется в предложении изображения для изображения плавающего символа валюты слева. самый характер. Символ по умолчанию — $; однако, если указано предложение CURRENCY = или CURRENCY SIGN, можно использовать многие другие символы.
• В некоторых языках ассемблера, таких как MIPS, знак $ используется для представления регистров.
• В ассемблере Honeywell 6000 series знак $, когда он используется в качестве адреса, означает адрес инструкции, в которой он встречается.
• В CMS-2 знак $ используется в качестве ограничителя оператора.
• В R (язык программирования) знак $ используется как оператор подмножества.
• В Q (язык программирования от Kx Systems) знак $ используется как оператор приведения / заполнения / перечисления / условного обозначения.
• В Sass, знак $ имеет префикс для определения переменной.

Операционные системы

• В CP / M и впоследствии во всех версиях DOS (86 -DOS, MS-DOS, PC DOS, другие) и производные, $ используется в качестве ограничителя строки (Int 21h с AH = 09h).
  • $ используется командой promptдля вставки специальных последовательностей в строку командной строки DOS.
• В Microsoft Windows $ добавляется к имени общего ресурса чтобы скрыть общую папку или ресурс. Например, «\ server share» будет виден другим компьютерам в сети, а «\ server share $» будет доступен только по явной ссылке. Скрытие общей папки или ресурса не повлияет на их права доступа, но может сделать их недоступными для программ или других функций, которые зависят от их видимости. Таким образом скрывается большинство административных общих ресурсов.
• В Unix-подобных системах $ часто является частью командной строки, в зависимости от пользовательская оболочка и параметры среды. Например, в параметрах среды по умолчанию для оболочки bash $ как часть командной строки указывается.

  Использование ! $(то же, что и !! 1 $и ! -1 $) означает последний аргумент предыдущей команды в bash : ! -2 $расширяется до последнего аргумента предпоследней команды, ! 5 $расширяется до последнего аргумента пятой команды и так далее. Например:

>touch my_first_file>echo «Это мой файл».>! $

где ! $заменяется на my_first_file.

• В протоколе доступа к каталогам LDAP $ используется в качестве разделителя строк в различных стандартных атрибутах записи, таких как как postalAddress.
• В операционной системе UNIVAC EXEC 8 «$» означает «система». Он добавляется к таким сущностям, как имена системных файлов, имя «отправителя» в сообщениях, отправляемых оператором, и имена по умолчанию для файлов, созданных системой (например, вывод компилятора), если не указано конкретное имя (например, TPF $, NAME $ и т. Д.)
• В RISC OS $ используется в системных переменных для отделения имени приложения от переменных, специфичных для этого приложения. Например, Draw $ Dirуказывает каталог, в котором находится приложение ! Draw. Он также используется для ссылки на корневой каталог файловой системы .

Приложения

• Microsoft Excel и другие программы для работы с электронными таблицами используют знак доллара ($) для обозначения фиксированного строка, фиксированная ссылка на столбец или абсолютная ссылка на ячейку.
• Знак доллара вводит разделитель подполей в компьютерном кодировании записей библиотечного каталога.
• $ соответствует концу строки или строки в sed, grep и POSIX и Perl регулярные выражения, и, как результат:
• $ означает конец строки или файла в текстовых редакторах, vi и производных.

Валюты, в которых используется знак доллара или песо

В дополнение к тем странам В мире, где используются долларов или песо, ряд других стран используют символ $ для обозначения своих валют, в том числе:

• никарагуанская кордова (обычно пишется как C $)
• Самоанская тала (транслитерация слова доллар)
• Тонганская паанга

Исключение составляет t он филиппинское песо, знак которого записывается как ₱.

. Знак доллара также иногда используется для обозначения малазийского ринггита (который заменил местный доллар ), хотя его официальное использование для представления валюты было прекращено с 1993 года.

В некоторых валютах используется cifrão (), похожий на знак доллара, но всегда с двумя штрихами:

• Cape Verde escudo
• Португальский эскудо (несуществующий)

Поскольку версия с одной полосой и версия с двумя полосами являются аллографами, любой данный шрифт будет содержать один или другой стиль, но не оба. Кроме того, электронный документ, написанный с использованием одного стиля, может быть впоследствии просмотрен с другим стилем благодаря замене шрифта . Следовательно, когда различие имеет решающее значение, лучше всего использовать трехбуквенное сокращение (USD, MXN и т. Д., См. ISO 4217 ).

Однако в Аргентина, знак $ всегда используется для песо, и если они хотят указать доллары, они всегда пишут 5 долларов США или 5 долларов США (5 долларов США).

В Соединенных Штатах, Мексика, Австралия, Аргентина, Новая Зеландия, Гонконг, островные государства Тихого океана и англоязычная Канада символ доллара или песо стоит перед числом. Пять долларов или песо пишутся и печатаются как 5 долларов, а пять центов записываются как 5 ¢. Во франкоязычной Канаде символ доллара обычно появляется после числа (5 $).

В играх и виртуальных мирах

В некоторых виртуальных мирах и игровых платформах символ $ для обозначения их собственных виртуальных валют, например:

• R $ — Robux (Roblox )
• S $ — Sansar Dollars (Sansar )
• L $ — Linden Dollars (Second Life )

Другое использование

Символ иногда используется в насмешке для обозначения жадности или чрезмерных денег, например, в «Micro $ oft », «George Luca $ », «Lar $ Ulrich », «Di $ ney «,» Chel $ ea «и» GW $ «; или предполагаемая открытая американизация, как в «$ ky «. Знак доллара также намеренно используется для стилизации таких имен, как A $ AP Rocky, Ke $ ha и Ty Dolla $ ign или таких слов, как ¥ € . В 1872 году Амброуз Бирс называл губернатора Калифорнии $ tealand Landford.

. В обозначении Scrabble после слова ставится знак доллара, чтобы указать, что оно действительно согласно североамериканским спискам слов, но не согласно британским спискам слов.

Символ доллара используется как единица реактивности для ядерного реактора, 1 $ — порог медленной критичности, означающий постоянную скорость реакции, а 2 $ — порог мгновенной критичности, что означает ядерное отклонение или взрыв.

Знак доллара использовался как буква туркменского алфавита с 1993 по 1999 год.

См. также

• испанский доллар
• Cifrão
• знак евро
• знак индийской рупии
• знак фунта
• Знак рубля
• Знак рупии
• Знак турецкой лиры
• Знак иены
• Знак юаня
• Знак вон

Примечания

Ссылки

Знак доллара

Полезное

Эта статья — о символе. О денежной единице см. Доллар; о других значениях см. $.

Символ со сходным начертанием: Ֆ · ֆ

Символ (знак) доллара ($) — типографский символ, который входит в группу «Управляющие символы C0 и основная латиница» (англ. C0 Controls and Basic Latin) стандарта Юникод: оригинальное название — dollar sign (англ.); код — U+0024. Его основное назначение — представление денежных единиц с названием «доллар» (прежде всего доллара США), однако он может использоваться и другими способами.

Начертание

Символ «$» представляет собой разновидность заглавной латинской буквы «S» с добавлением одной или двух параллельных вертикальных линий. Количество линий зависит исключительно от шрифта, использованного для вывода символа^[1][2].

Иллюстрации с примерами

Знак доллара США с одной чертой	Знак доллара США с двумя чертами

Разновидности символа, включённые в стандарт Юникод:

• 💲 — «крупный символ доллара» (англ. heavy dollar sign; U+1F4B2)^[3], который является одной из идеограмм языка эмодзи^[4];
• ＄ — «широкий символ доллара» (англ. fullwidth dollar sign; U+FF04)^[5], введённый для совместимости с символами ККЯ^[en];
• ﹩ — «маленький символ доллара» (англ. small dollar sign; U+FE69)^[6], введённый для совместимости с китайским национальным стандартом CNS 11643^[en].

Знак «$» также входит в состав других символов Юникода^[7], входящих в состав языка эмодзи^[4]:

• 💰 — «мешок денег» (англ. money bag; U+1F4B0), где знак доллара может быть заменён символом любой другой валюты;
• 💱 — «обмен валют» (англ. currency exchange; U+1F4B1);
• 💵 — «банкнота со знаком доллара» (англ. banknote with dollar sign; U+1F4B5);
• 🤑 — «лицо с языком из денег» (англ. money-mouth face; U+1F911).

В некоторых наборах символ доллара также используется при оформлении идеограммы «деньги с крыльями» (англ. money with wings) — 💸 (U+1F4B8).

Идеограммы эмодзи с символом доллара

• 

  Полужирный символ доллара

• 

  Мешок денег

• 

  Обмен валют

• 

  Банкнота со знаком доллара

• 

  Деньги с крыльями

• 

  Деньги на лице и языке (предчувствие выгоды)

Расположение относительно числа

В англоязычной литературе символ доллара ставится перед числами без пробела ($100)^[8]. В русском языке строгого правила, регламентирующего расположение знаков валют, вообще, и символа доллара, в частности, относительно числа, нет^[9][10]. Мнения специалистов по вопросу их использования противоречивы. Одни рекомендуют не употреблять знаки валют в неспециализированных текстах, а в специализированных ставить после чисел через пробел (100 $)^[11]. Другие указывают на широкое использование символов денежных единиц (прежде всего доллара — $ и евро — €) именно в неспециализированных изданиях, в частности, в традиционных средствах массовой информации (в газетах и журналах), объясняя этот факт «экономией языковых и графических средств для передачи каких-либо понятий общепринятым в той или иной среде способом»^[12]. Третьи считают, что в текстах на русском языке знак доллара нужно писать справа от чисел, но при этом отмечают, что специализированные издания могут составлять исключения^[13]. Противоречивы также рекомендации специалистов портала «Грамота.ру»: отвечая на один вопрос, они рекомендуют ставить символ доллара после числа («наши рекомендации — писать знак $ в неспециализированных изданиях через пробел после числа»^[9]), а на другой — не просто перед числом, но еще и с пробелом («принято писать так: $ 4 млн»^[14]).

Происхождение символа

Существует множество версий происхождения символа доллара^[15][16].

Аббревиатура «US» — United States

Одна из самых популярных версий происхождения символа доллара гласит, что знак «$» образован из аббревиатуры US (от United States — Соединённые штаты) путём наложения заглавной буквы «U» на заглавную букву «S». Она изложена, например, в романе Айн Рэнд «Атлант расправил плечи». В 10-й главе, которая называется «Знак доллара» (англ. The Sign of the Dollar), писательница называет «$» символом нации, свободной экономики, свободного мышления^[15]. Исследователи, однако отмечают, что какие-либо документальные подтверждения этой версии, растиражированной газетами и даже энциклопедиями, напрочь отсутствуют^[16].

Впервые эта версия была приведена в 1876 году в лондонском научном журнале Notes and Queries^[en] со ссылкой на неназванную старую газету, где говорилось, что символ «$» — это переплетённые буквы «U» и «S», являющиеся сокращением слов United States (Соединённые Штаты) или олицетворяющего их Uncle Sam (Дядя Сэм)^[17].

Аббревиатура «Ps» — Pesos

Менее популярная, но более авторитетная версия состоит в том, что символ «$» происходит от сокращения слова «песо» во множественном числе (исп. peso, pesos). Оно записывалось несколькими вариантами — как «Ps», как «P^s» (то есть буква «s» поднята над основной строкой), наконец, через наложение строчной буквы «s» на заглавную «p», при этом последняя в конце XVIII века сокращается до двух или одной вертикальной линии^{[17][18][19][20][21]}.

Иногда отмечается, что эта версия объясняет появление одной вертикальной линии, но не двух^[15]. Тем не менее, именно она считается наиболее авторитетной и убедительной. Среди аргументов часто приводится письмо Оливера Поллока^[en], датированное 1778 годом, где одна и та же сумма записана сначала с использованием сокращения «P^s», а затем символа, идентичного современному знаку «$»^[16][22].

Аббревиатура «P8» — Piece of Eight

Другая версия о связи символа доллара с песо гласит, что испанское песо равнялось восьми реалам, поэтому часто называлось восьмериком (англ. Piece of Eight), а при записи сокращалось до «P8» или «/8/». Латинская «P» или две косые черты, наложенные на цифру «8», и образовали в конце концов современный символ доллара^[15][16].

Пиастр с колоннами

Ещё одна версия, связывающая символ доллара с песо, основана на схожести знака «$» с обвитыми лентой Геркулесовыми столпами, одним из основных элементов герба Испании. Геркулесовы столпы с вьющейся лентой, на которой был написан девиз Non plus ultra, что значит «Не дальше (пределов мира)», был выбран символом государства в 1492 году. После открытия Колумбом новых земель девиз трансформировался в Plus ultra («Ещё дальше»). Этот символ чеканился на пиастрах (другие названия — испанское песо, мексиканское песо, испанский доллар, пиастр с колоннами и т. п.), выпускавшихся огромными тиражами и широко распространившимися по всей Америке. Если принять эту версию, два столпа превращаются в две вертикальные линии символа доллара^[15][16].

• 

• 

• 

Аббревиатура «PTSI» — знак монетного двора в Потоси

Знак монетного двора, несомненно схожий со знаком доллара, размещался на пиастрах, которые чеканились с 1573 по 1825 год в Потоси, одном из мировых центров добычи серебра XVI—XVII веков. Этот знак, представляющий собой монограмму PTSI (от Potosi), можно увидеть на круговой легенде пиастров с колоннами справа от года чеканки^[15].

Солидус и шиллинг

В письменностях, основанных на латинице, сокращения часто образуются с помощью перечёркивания первой буквы слова. Так, например, символ фунта (£) — это перечёркнутая рукописная буква «L», первая в слове Libra — либра, от которой произошёл фунт. Сокращение слова «шиллинг», активно использовавшееся для краткого представления этой денежной единицы вплоть до перехода Великобритании на десятичную денежную систему, — солидус, или косая черта (/). Будучи наложенным на букву «S», солидус образует символ доллара. Версия не объясняет, почему для сокращения слова «доллар» была использована буква «S», а не «D» (от англ. Dollar), но её сторонники отмечают сохраняющуюся до сих пор связь получивших независимость колоний с прежней метрополией в том числе и с точки зрения названий денежных единиц. Например, в США один цент до сих пор в просторечии называется «пенни»^[15].

Сифран

В XV—XVIII веках при записи денежных сумм в северо-западной Италии, а также в Испании, Мексике и других испаноязычных странах в качестве разделителя разрядов использовался символ, называвшийся кальдероном. В Португалии для отделения тысяч служил символ «сифран», идентичный символу доллара — заглавная буква «S», перечёркнутая двумя вертикальными линиями. В таком виде он, якобы, и был заимствован североамериканцами в качестве символа доллара^[15][16][23].

«Рабская теория»

Согласно этой версии, символ «$» произошёл в результате визуализации испанских слов esclavo (раб) и clavo (гвоздь, которым закрепляли оковы на ногах раба). Слово esclavo могло претерпеть несколько визуальных трансформаций — сначала оно могло быть представлено как S-clavo с последующей заменой слова clavo на его образ в виде вертикальной линии, превратившись в конце концов в символ «$». Поскольку количество рабов символизировало размеры богатства владевшего ими человека, запись их количества с помощью получившегося символа стала означать и сумму денег^[15].

Аббревиатура «SH» — sheet

Сотрудники компании Em Letterpress из Нью-Бедфорда (Массачусетс) в мае 2008 года сделали предположение, что символ доллара мог возникнуть как маркировка пересчитываемых вручную печатных листов (англ. sheet), то есть, например «7$» означало «семь листов». Наспех нацарапанная буква «s» (первая в слове sheet — лист) похожа на цифру «5», поэтому при записи пересчитанных листов использовали сокращение «sh», которое со временем трансформировалось в символ «$» с двумя вертикальными линиями: буква «H» наложилась на «S». Возможно ту же систему записи использовали на фабриках, занимавшихся печатью бумажных денег, откуда и произошёл современный символ доллара^[15].

Аббревиатура «IIS» — римский сестерций

Существует версия происхождения знака от обозначения древнеримской денежной единицы сестерций — sestertius от semis+tertius (полтретья, два с половиной), серебряная монета достоинством в два с половиной фунта меди. Сестерций обозначался буквами «LLS» или «IIS», иногда «HS». Эта аббревиатура расшифровывается так: «Libra-Libra-Semis», — то есть: «Фунт-Фунт-Половина». При сокращённом написании две буквы «L» с усечённой нижней поперечной чёрточкой накладывались на букву «S» и получался как бы знак доллара. Именно так обозначалась на письме денежная единица сестерций в Древнем Риме. Древнеримская тема была очень модной в эпоху Просвещения. Так, например, место расположения Конгресса США называется Капитолием (главный холм в Риме), а верхняя палата Конгресса США называется Сенатом — так же, как в Древнем Риме^[17][24].

Использование символа

Сокращение доллара США

Символ доллара в современном начертании появился в деловой переписке конца 70-х годов XVIII века. При этом параллельно использовались такие сокращения, как Doll и D. Чаще всего, как и уже распространённый в то время символ фунта (£), знак писался перед цифрами, но иногда — и после них^[17].

В печатном виде символ доллара впервые встречается в 1797 году в книге Чонси Ли (англ. Chauncey Lee) American Accomptant, где автор предложил использовать для обозначения базовых денежных единиц Североамериканских штатов следующие символы^[16][25]:

• милль — одна косая черта (/);
• цент — две косых черты (//);
• дайм — буква «S», перечёркнутая двумя косыми чертами;
• доллар — удвоенная буква «S», перечёркнутая двумя косыми чертами;
• игл, или орёл (англ. eagle — дословно «орёл») — буква «E».

То есть современному символу доллара соответствовал предложенный Ли символ дайма.

На денежных знаках США символ $ впервые появился в 1917 году — на реверсе банкноты достоинством 1 доллар^{[источник не указан 2595 дней]}.

Сокращение названий других денежных единиц

Знак «$», как правило, используется в качестве сокращения слова «доллар» (прежде всего, доллара США), однако может представлять и такие денежные единицы, как боливиано, кордоба, мильрейс, паанга, патака, песо (кроме филиппинского), реал (в частности, бразильский, аргентинский), тала, эскудо.

Знак «$» используется как составная часть символов ряда денежных единиц Бразилии: крузейро — Cr$, нового крузейро — NCr$, крузадо — Cz$, нового крузадо — NCz$, крузейро реала — CR$ и современного реала — R$.

Знак «$» также может выступать символом или входить в состав аббревиатур, представляющих многие вымышленные, частные и комплементарные валюты.

Неполный список денежных единиц, для сокращения названий которых используется символ «$», приведён ниже (более полный список денежных единиц португалоязычных стран см. в статье «Сифран»).

Для представления некоторых разновидностей денежных единиц с названием «доллар» могут использоваться другие символы и идеограммы, например^[1]:

• 元 — единая идеограмма CJK 5143, используемая для обозначения гонконгского доллара;
• 圓 — единая идеограмма CJK 5713, используемая для обозначения гонконгского и тайваньского долларов.

Разделитель разрядов и десятичный разделитель — сифран

С XV века в испаноязычных рукописях встречается символ, который представляет собой почти закруглённую «U» или незаконченную «O», перечёркнутую одной или двумя горизонтальными или вертикальными линиями. Название этого символа — «кальдерон» (исп. calderón), назначение — разделение разрядов при записи больших чисел, то есть для визуального отделения тысяч от сотен, десятков и единиц. По мнению американского математика Флориана Кэджори, вероятнее всего, это результат многовековой трансформации какой-то из разновидностей римских символов, использовавшихся для записи тысяч: Ⅿ, ↀ, ⅭⅠↃ, ⅭⅠⅠↃ, ͳ. В Португалии символ с тем же назначением, но иным начертанием получил название «сифран» (порт. cifrão от лат. cifra — цифра). Он идентичен современному символу доллара ($), но, по мнению Кэджори, имеет другое происхождение и восходит к некоторым разновидностям испанского кальдерона^[26][27].

В конце XVIII века сифран, продолжая служить в качестве разделителя разрядов, использовался для обозначения номинала банкнот в португальских реалах (см. иллюстрацию справа), а в первой половине XIX века — банкнот в бразильских реалах (см. первую иллюстрацию внизу). При записи символ отделял в денежной сумме три ноля справа, указывая, слева от знака, сумму в кратной единице — мильрейсах. Иногда он использовался в сочетании с сокращённым обозначением реала rs. Так, сумма в 1000 реалов (1 мильрейс) обозначалась 1$000, Rs. 1$000 или 1$000 rs. Один из вариантов записи — без нулей, то есть 1$, что означает «1 мильрейс» (см. вторую иллюстрацию внизу). В начале XX века, с введением эскудо, заменившего португальский реал в соотношении 1:1000, символ стал выполнять функцию десятичного разделителя, то есть разделять основную денежную единицу (эскудо) и её дробную (сентаво), равную ¹⁄₁₀₀ основной, — 2$50, что означает «Два эскудо и 50 сентаво» (см. третью иллюстрацию внизу)^[28].

Сифран не включён в стандарт Юникод и, выполняя функции краткого представления эскудо, мильрейса и других денежных единиц португалоязычных стран, рассматривается в качестве знака, идентичного символу доллара, или местного названия символа доллара^{[1][29][30][31]}.

• 

  1000 бразильских реалов (1 мильрейс) первой половины XIX века

• 

  1000 бразильских реалов (1 мильрейс) неизвестного года

• 

  2,50 португальского эскудо 1935 года

Оператор в языках программирования

Знак $ применяется как самостоятельный символ во многих языках программирования:

• в языке программирования Бейсик ставится в конце имени строковой переменной или имени функции, возвращающей значение строкового типа;
• в Паскале применяется для записи чисел в 16-ричной системе;
• в PHP, Perl и многих других языках с символа $ начинается имя переменной;
• в языке Tcl обозначает значение переменной;
• в табличных процессорах, например, OpenOffice.org Calc и Microsoft Excel используется для указания неизменяемого индекса ячейки в формуле;
• в регулярных выражениях обозначает конец строки;
• в языке ассемблера (AT&T-синтаксис) указывает на числовое значение константы;
• в некоторых других случаях используется как указатель на служебные переменные;
• в jQuery, широко используемой библиотеке JavaScript, используется как имя главной в библиотеке функции.

Другие способы использования

С 1993 по 1999 год в процессе перехода Туркмении с кириллицы на латиницу для записи некоторых специфических букв туркменского алфавита использовались такие знаки валют, как «$» (символ доллара), «¢» (символ цента), «¥» (символ иены) и «£» (символ фунта), поскольку в то время на клавиатурах не было некоторых специфических букв нового туркменского алфавита. Заглавной «$» соответствовала строчная «¢», заглавной «¥» — строчная «ÿ», а заглавной «£» — строчная «ſ». В 1999 году вместо них были введены другие символы: вместо «$/¢» — «Ş/ş», вместо «¥/ÿ» — «Ý/ý», вместо «£/ſ» — «Ž/ž»^[32]. Символы «$» и «¥» (разновидность с одной чертой) встречаются на туркменских банкнотах образца 1993 года достоинством до 500 манатов.

В поп-культуре символ «$» может заменять букву «S», например, в псевдониме певицы Кеши (англ. Ke$ha).

В психоанализе Жака Лакана перечеркнутая буква S, идентичная по написанию символу доллара, является обозначением расщепленного («барированного») субъекта психоанализа.

Примечания

Источники

• Анненкова И. В. Принципы использования латинской графики в СМИ // Мир русского слова : журнал. — 2008. — № 3. — С. 11—17. — ISSN 1811-1629.
• Лебедев А. А. Ководство. — 7-е изд. — М.: Издательство Студии Артемия Лебедева, 2021. — 560 с. — ISBN 978-5-98062-135-3.
• Мильчин А. Э., Чельцова Л. К. Справочник издателя и автора. — 6-е изд.. — М.: Издательство Студии Артемия Лебедева, 2021. — 1010 с. — ISBN 978-5-98062-137-7.
• Петров К. Е. Типографский компьютерный набор и верстка : Справочник. — М.: Петров К. Е., 2013. — 1216 с. — ISBN 978-5-89176-512-2.
• A History of Mathematical Notations / by Florian Cajori. — Vol. I. — New York: Cosimo, 2007. — ISBN 978-1-60206-685-4.
• A History of Mathematical Notations / by Florian Cajori. — Vol. II. — New York: Cosimo, 2007. — ISBN 978-1-60206-714-1.
• History of Mathematics / by David Eugene Smith. — Vol. I. — 1953. — ISBN 0-486-20430-8.
• Standard Catalog of World Paper Money General Issues (1368—1960) / by George S. Cuhaj. — Krause, 2010. — ISBN 978-1-4402-1293-2.

Ссылки

• $ на сайте Scriptsource.org (англ.)

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United States dollar

One-dollar bill (obverse)
ISO 4217
Code	USD (numeric: 840)
Subunit	0.01
Unit
Symbol	$, US$, U$‎
Nickname	List Ace, bean, bill, bone, buck, deuce, dub, ducat, doubloon, fin, frog, greenback, large, simoleons, skins, smackeroo, smackers, spondulix, Tom, yard, and eagle Plural: dead presidents, green, bones, clams Based on denomination: Washingtons, Jeffersons, Lincolns, Hamiltons, Jacksons, Grants, Benjamins, C-note, grand, sawbuck, single, Bluefaces
Denominations
Superunit
10	Eagle
Subunit
1⁄10	Dime
1⁄100	Cent
1⁄1000	Mill
Symbol
Cent	¢
Mill	₥
Banknotes
Freq. used	$1, $5, $10, $20, $50, $100
Rarely used	$2 (still printed); $500, $1,000, $5,000, $10,000 (discontinued, still legal tender)
Coins
Freq. used	1¢, 5¢, 10¢, 25¢
Rarely used	50¢, $1 (still minted); 1⁄2¢ 2¢, 3¢, 20¢, $2.50, $3, $5, $10, $20 (discontinued, still legal tender)
Demographics
Date of introduction	April 2, 1792; 230 years ago[1]
Replaced	Continental currency Various foreign currencies, including: Pound sterling Spanish dollar
User(s)	see § Formal (11), § Informal (11)
Issuance
Central bank	Federal Reserve
Website	federalreserve.gov
Printer	Bureau of Engraving and Printing
Mint	United States Mint
Website	usmint.gov
Valuation
Inflation	6.4%
Source	BLS, January 2023
Method	CPI
Pegged by	see § Pegged currencies

The United States dollar (symbol: $; code: USD; also abbreviated US$ or U.S. Dollar, to distinguish it from other dollar-denominated currencies; referred to as the dollar, U.S. dollar, American dollar, or colloquially buck) is the official currency of the United States and several other countries. The Coinage Act of 1792 introduced the U.S. dollar at par with the Spanish silver dollar, divided it into 100 cents, and authorized the minting of coins denominated in dollars and cents. U.S. banknotes are issued in the form of Federal Reserve Notes, popularly called greenbacks due to their predominantly green color.

The monetary policy of the United States is conducted by the Federal Reserve System, which acts as the nation’s central bank.

The U.S. dollar was originally defined under a bimetallic standard of 371.25 grains (24.057 g) (0.7735 troy ounces) fine silver or, from 1837, 23.22 grains (1.505 g) fine gold, or $20.67 per troy ounce. The Gold Standard Act of 1900 linked the dollar solely to gold. From 1934, its equivalence to gold was revised to $35 per troy ounce. Since 1971, all links to gold have been repealed.^[2]

The U.S. dollar became an important international reserve currency after the First World War, and displaced the pound sterling as the world’s primary reserve currency by the Bretton Woods Agreement towards the end of the Second World War. The dollar is the most widely used currency in international transactions,^[3] and a free-floating currency. It is also the official currency in several countries and the de facto currency in many others,^[4][5] with Federal Reserve Notes (and, in a few cases, U.S. coins) used in circulation.

As of February 10, 2021, currency in circulation amounted to US$2.10 trillion, $2.05 trillion of which is in Federal Reserve Notes (the remaining $50 billion is in the form of coins and older-style United States Notes).^[6]

Overview[edit]

In the Constitution[edit]

Article I, Section 8 of the U.S. Constitution provides that Congress has the power «[t]o coin money.»^[7] Laws implementing this power are currently codified in Title 31 of the U.S. Code, under Section 5112, which prescribes the forms in which the United States dollars should be issued.^[8] These coins are both designated in the section as «legal tender» in payment of debts.^[8] The Sacagawea dollar is one example of the copper alloy dollar, in contrast to the American Silver Eagle which is pure silver. Section 5112 also provides for the minting and issuance of other coins, which have values ranging from one cent (U.S. Penny) to 100 dollars.^[8] These other coins are more fully described in Coins of the United States dollar.

Article I, Section 9 of the Constitution provides that «a regular Statement and Account of the Receipts and Expenditures of all public Money shall be published from time to time,»^[9] which is further specified by Section 331 of Title 31 of the U.S. Code.^[10] The sums of money reported in the «Statements» are currently expressed in U.S. dollars, thus the U.S. dollar may be described as the unit of account of the United States.^[11] «Dollar» is one of the first words of Section 9, in which the term refers to the Spanish milled dollar, or the coin worth eight Spanish reales.

The Coinage Act[edit]

In 1792, the U.S. Congress passed the Coinage Act, of which Section 9 authorized the production of various coins, including:^[12]: 248

Dollars or Units—each to be of the value of a Spanish milled dollar as the same is now current, and to contain three hundred and seventy-one grains and four sixteenth parts of a grain of pure, or four hundred and sixteen grains of standard silver.

Section 20 of the Act designates the United States dollar as the unit of currency of the United States:^{[12]: 250–1}

[T]he money of account of the United States shall be expressed in dollars, or units…and that all accounts in the public offices and all proceedings in the courts of the United States shall be kept and had in conformity to this regulation.

Decimal units[edit]

Unlike the Spanish milled dollar, the Continental Congress and the Coinage Act prescribed a decimal system of units to go with the unit dollar, as follows:^[13][14] the mill, or one-thousandth of a dollar; the cent, or one-hundredth of a dollar; the dime, or one-tenth of a dollar; and the eagle, or ten dollars. The current relevance of these units:

• Only the cent (¢) is used as everyday division of the dollar.
• The dime is used solely as the name of the coin with the value of 10 cents.
• The mill (₥) is relatively unknown, but before the mid-20th century was familiarly used in matters of sales taxes, as well as gasoline prices, which are usually in the form of $ΧΧ.ΧΧ9 per gallon (e.g., $3.599, commonly written as $3.59+9⁄10).^[15][16]
• The eagle is also largely unknown to the general public.^[16] This term was used in the Coinage Act of 1792 for the denomination of ten dollars, and subsequently was used in naming gold coins.

The Spanish peso or dollar was historically divided into eight reales (colloquially, bits) – hence pieces of eight. Americans also learned counting in non-decimal bits of 12+1⁄2 cents before 1857 when Mexican bits were more frequently encountered than American cents; in fact this practice survived in New York Stock Exchange quotations until 2001.^[17][18]

In 1854, Secretary of the Treasury James Guthrie proposed creating $100, $50, and $25 gold coins, to be referred to as a union, half union, and quarter union, respectively,^[19] thus implying a denomination of 1 Union = $100. However, no such coins were ever struck, and only patterns for the $50 half union exist.

When currently issued in circulating form, denominations less than or equal to a dollar are emitted as U.S. coins, while denominations greater than or equal to a dollar are emitted as Federal Reserve Notes, disregarding these special cases:

• Gold coins issued for circulation until the 1930s, up to the value of $20 (known as the double eagle)
• Bullion or commemorative gold, silver, platinum, and palladium coins valued up to $100 as legal tender (though worth far more as bullion).
• Civil War paper currency issue in denominations below $1, i.e. fractional currency, sometimes pejoratively referred to as shinplasters.

Etymology[edit]

Further information: Dollar

In the 16th century, Count Hieronymus Schlick of Bohemia began minting coins known as joachimstalers, named for Joachimstal, the valley in which the silver was mined. In turn, the valley’s name is titled after Saint Joachim, whereby thal or tal, a cognate of the English word dale, is German for ‘valley.’^[20] The joachimstaler was later shortened to the German taler, a word that eventually found its way into many languages, including:^[20]
tolar (Czech, Slovak and Slovenian); daler (Danish and Swedish);
dalar and daler (Norwegian); daler or daalder (Dutch);
talari (Ethiopian);
tallér (Hungarian);
tallero (Italian);
دولار (Arabic); and dollar (English).

Though the Dutch pioneered in modern-day New York in the 17th century the use and the counting of money in silver dollars in the form of German-Dutch reichsthalers and native Dutch leeuwendaalders (‘lion dollars’), it was the ubiquitous Spanish American eight-real coin which became exclusively known as the dollar since the 18th century.^[21]

Nicknames[edit]

The colloquialism buck(s) (much like the British quid for the pound sterling) is often used to refer to dollars of various nations, including the U.S. dollar. This term, dating to the 18th century, may have originated with the colonial leather trade, or it may also have originated from a poker term.^[22]

Greenback is another nickname, originally applied specifically to the 19th-century Demand Note dollars, which were printed black and green on the backside, created by Abraham Lincoln to finance the North for the Civil War.^[23] It is still used to refer to the U.S. dollar (but not to the dollars of other countries). The term greenback is also used by the financial press in other countries, such as
Australia,^[24] New Zealand,^[25] South Africa,^[26] and India.^[27]

Other well-known names of the dollar as a whole in denominations include greenmail, green, and dead presidents, the latter of which referring to the deceased presidents pictured on most bills. Dollars in general have also been known as bones (e.g. «twenty bones» = $20). The newer designs, with portraits displayed in the main body of the obverse (rather than in cameo insets), upon paper color-coded by denomination, are sometimes referred to as bigface notes or Monopoly money.^{[citation needed]}

Piastre was the original French word for the U.S. dollar, used for example in the French text of the Louisiana Purchase. Though the U.S. dollar is called dollar in Modern French, the term piastre is still used among the speakers of Cajun French and New England French, as well as speakers in Haiti and other French-speaking Caribbean islands.

Nicknames specific to denomination:

• The quarter dollar coin is known as two bits, betraying the dollar’s origins as the «piece of eight» (bits or reales).^[17]
• The $1 bill is nicknamed buck or single.
• The infrequently-used $2 bill is sometimes called deuce, Tom, or Jefferson (after Thomas Jefferson).
• The $5 bill is sometimes called Lincoln, fin, fiver, or five-spot.
• The $10 bill is sometimes called sawbuck, ten-spot, or Hamilton (after Alexander Hamilton).
• The $20 bill is sometimes called double sawbuck, Jackson (after Andrew Jackson), or double eagle.
• The $50 bill is sometimes called a yardstick, or a grant, after President Ulysses S. Grant.
• The $100 bill is called Benjamin, Benji, Ben, or Franklin, referring to its portrait of Benjamin Franklin. Other nicknames include C-note (C being the Roman numeral for 100), century note, or bill (e.g. two bills = $200).
• Amounts or multiples of $1,000 are sometimes called grand in colloquial speech, abbreviated in written form to G, K, or k (from kilo; e.g. $10k = $10,000). Likewise, a large or stack can also refer to a multiple of $1,000 (e.g. «fifty large» = $50,000).

Dollar sign[edit]

The symbol $, usually written before the numerical amount, is used for the U.S. dollar (as well as for many other currencies). The sign was the result of a late 18th-century evolution of the scribal abbreviation p^s for the peso, the common name for the Spanish dollars that were in wide circulation in the New World from the 16th to the 19th centuries. The p and the s eventually came to be written over each other giving rise to $.^{[28][29][30][31]}

Another popular explanation is that it is derived from the Pillars of Hercules on the Spanish Coat of arms of the Spanish dollar. These Pillars of Hercules on the silver Spanish dollar coins take the form of two vertical bars (||) and a swinging cloth band in the shape of an S.^{[citation needed]}

Yet another explanation suggests that the dollar sign was formed from the capital letters U and S written or printed one on top of the other. This theory, popularized by novelist Ayn Rand in Atlas Shrugged,^[32] does not consider the fact that the symbol was already in use before the formation of the United States.^[33]

History[edit]

Origins: the Spanish dollar[edit]

The U.S. dollar was introduced at par with the Spanish-American silver dollar (or Spanish peso, Spanish milled dollar, eight-real coin, piece-of-eight). The latter was produced from the rich silver mine output of Spanish America; minted in Mexico City, Potosí (Bolivia), Lima (Peru) and elsewhere; and was in wide circulation throughout the Americas, Asia and Europe from the 16th to 19th centuries. The minting of machine-milled Spanish dollars since 1732 boosted its worldwide reputation as a trade coin and positioned it to be model for the new currency of the United States.

Even after the United States Mint commenced issuing coins in 1792, locally minted dollars and cents were less abundant in circulation than Spanish American pesos and reales; hence Spanish, Mexican and American dollars all remained legal tender in the United States until the Coinage Act of 1857. In particular, Colonists’ familiarity with the Spanish two-real quarter peso was the reason for issuing a quasi-decimal 25-cent quarter dollar coin rather than a 20-cent coin.

For the relationship between the Spanish dollar and the individual state colonial currencies, see Connecticut pound, Delaware pound, Georgia pound, Maryland pound, Massachusetts pound, New Hampshire pound, New Jersey pound, New York pound, North Carolina pound, Pennsylvania pound, Rhode Island pound, South Carolina pound, and Virginia pound.

Coinage Act of 1792[edit]

On July 6, 1785, the Continental Congress resolved that the money unit of the United States, the dollar, would contain 375.64 grains of fine silver; on August 8, 1786, the Continental Congress continued that definition and further resolved that the money of account, corresponding with the division of coins, would proceed in a decimal ratio, with the sub-units being mills at 0.001 of a dollar, cents at 0.010 of a dollar, and dimes at 0.100 of a dollar.^[13]

After the adoption of the United States Constitution, the U.S. dollar was defined by the Coinage Act of 1792. It specified a «dollar» based on the Spanish milled dollar to contain 371+4⁄16 grains of fine silver, or 416.0 grains (26.96 g) of «standard silver» of fineness 371.25/416 = 89.24%; as well as an «eagle» to contain 247+4⁄8 grains of fine gold, or 270.0 grains (17.50 g) of 22 karat or 91.67% fine gold.^[34] Alexander Hamilton arrived at these numbers based on a treasury assay of the average fine silver content of a selection of worn Spanish dollars, which came out to be 371 grains. Combined with the prevailing gold-silver ratio of 15, the standard for gold was calculated at 371/15 = 24.73 grains fine gold or 26.98 grains 22K gold. Rounding the latter to 27.0 grains finalized the dollar’s standard to 24.75 grains of fine gold or 24.75*15 = 371.25 grains = 24.0566 grams = 0.7735 troy ounces of fine silver.

The same coinage act also set the value of an eagle at 10 dollars, and the dollar at 1⁄10 eagle. It called for silver coins in denominations of 1, 1⁄2, 1⁄4, 1⁄10, and 1⁄20 dollar, as well as gold coins in denominations of 1, 1⁄2 and 1⁄4 eagle. The value of gold or silver contained in the dollar was then converted into relative value in the economy for the buying and selling of goods. This allowed the value of things to remain fairly constant over time, except for the influx and outflux of gold and silver in the nation’s economy.^[35]

Though a Spanish dollar freshly minted after 1772 theoretically contained 417.7 grains of silver of fineness 130/144 (or 377.1 grains fine silver), reliable assays of the period in fact confirmed a fine silver content of 370.95 grains (24.037 g) for the average Spanish dollar in circulation.
^[36]
The new U.S. silver dollar of 371.25 grains (24.057 g) therefore compared favorably and was received at par with the Spanish dollar for foreign payments, and after 1803 the United States Mint had to suspend making this coin out of its limited resources since it failed to stay in domestic circulation. It was only after Mexican independence in 1821 when their peso’s fine silver content of 377.1 grains was firmly upheld, which the U.S. later had to compete with using a heavier 378.0 grains (24.49 g) Trade dollar coin.

Design[edit]

The early currency of the United States did not exhibit faces of presidents, as is the custom now;^[37] although today, by law, only the portrait of a deceased individual may appear on United States currency.^[38] In fact, the newly formed government was against having portraits of leaders on the currency, a practice compared to the policies of European monarchs.^[39] The currency as we know it today did not get the faces they currently have until after the early 20th century; before that «heads» side of coinage used profile faces and striding, seated, and standing figures from Greek and Roman mythology and composite Native Americans. The last coins to be converted to profiles of historic Americans were the dime (1946) and the Dollar (1971).

Continental currency[edit]

After the American Revolution, the thirteen colonies became independent. Freed from British monetary regulations, they each issued £sd paper money to pay for military expenses. The Continental Congress also began issuing «Continental Currency» denominated in Spanish dollars. For its value relative to states’ currencies, see Early American currency.

Continental currency depreciated badly during the war, giving rise to the famous phrase «not worth a continental».^[40] A primary problem was that monetary policy was not coordinated between Congress and the states, which continued to issue bills of credit. Additionally, neither Congress nor the governments of the several states had the will or the means to retire the bills from circulation through taxation or the sale of bonds.^[41] The currency was ultimately replaced by the silver dollar at the rate of 1 silver dollar to 1000 continental dollars. This resulted in the clause «No state shall… make anything but gold and silver coin a tender in payment of debts» being written in to the United States Constitution article 1, section 10.

Silver and gold standards, 19th century[edit]

From implementation of the 1792 Mint Act to the 1900 implementation of the gold standard the dollar was on a bimetallic silver-and-gold standard, defined as either 371.25 grains (24.056 g) of fine silver or 24.75 grains of fine gold (gold-silver ratio 15).

Subsequent to the Coinage Act of 1834 the dollar’s fine gold equivalent was revised to 23.2 grains; it was slightly adjusted to 23.22 grains (1.505 g) in 1837 (gold-silver ratio ~16). The same act also resolved the difficulty in minting the «standard silver» of 89.24% fineness by revising the dollar’s alloy to 412.5 grains, 90% silver, still containing 371.25 grains fine silver. Gold was also revised to 90% fineness: 25.8 grains gross, 23.22 grains fine gold.

Following the rise in the price of silver during the California Gold Rush and the disappearance of circulating silver coins, the Coinage Act of 1853 reduced the standard for silver coins less than $1 from 412.5 grains to 384 grains (24.9 g), 90% silver per 100 cents (slightly revised to 25.0 g, 90% silver in 1873). The Act also limited the free silver right of individuals to convert bullion into only one coin, the silver dollar of 412.5 grains; smaller coins of lower standard can only be produced by the United States Mint using its own bullion.

Summary and links to coins issued in the 19th century:

• In base metal: 1/2 cent, 1 cent, 5 cents.
• In silver: half dime, dime, quarter dollar, half dollar, silver dollar.
• In gold: gold $1, $2.50 quarter eagle, $5 half eagle, $10 eagle, $20 double eagle
• Less common denominations: bronze 2 cents, nickel 3 cents, silver 3 cents, silver 20 cents, gold $3.

Note issues, 19th century[edit]

In order to finance the War of 1812, Congress authorized the issuance of Treasury Notes, interest-bearing short-term debt that could be used to pay public dues. While they were intended to serve as debt, they did function «to a limited extent» as money. Treasury Notes were again printed to help resolve the reduction in public revenues resulting from the Panic of 1837 and the Panic of 1857, as well as to help finance the Mexican–American War and the Civil War.

Paper money was issued again in 1862 without the backing of precious metals due to the Civil War. In addition to Treasury Notes, Congress in 1861 authorized the Treasury to borrow $50 million in the form of Demand Notes, which did not bear interest but could be redeemed on demand for precious metals. However, by December 1861, the Union government’s supply of specie was outstripped by demand for redemption and they were forced to suspend redemption temporarily. In February 1862 Congress passed the Legal Tender Act of 1862, issuing United States Notes, which were not redeemable on demand and bore no interest, but were legal tender, meaning that creditors had to accept them at face value for any payment except for public debts and import tariffs. However, silver and gold coins continued to be issued, resulting in the depreciation of the newly printed notes through Gresham’s Law. In 1869, Supreme Court ruled in Hepburn v. Griswold that Congress could not require creditors to accept United States Notes, but overturned that ruling the next year in the Legal Tender Cases. In 1875, Congress passed the Specie Payment Resumption Act, requiring the Treasury to allow U.S. Notes to be redeemed for gold after January 1, 1879.

Gold standard, 20th century[edit]

Though the dollar came under the gold standard de jure only after 1900, the bimetallic era was ended de facto when the Coinage Act of 1873 suspended the minting of the standard silver dollar of 412.5 grains (26.73 g = 0.8595 oz t), the only fully legal tender coin that individuals could convert bullion into in unlimited (or Free silver) quantities,^[a] and right at the onset of the silver rush from the Comstock Lode in the 1870s. This was the so-called «Crime of ’73».

The Gold Standard Act of 1900 repealed the U.S. dollar’s historic link to silver and defined it solely as 23.22 grains (1.505 g) of fine gold (or $20.67 per troy ounce of 480 grains). In 1933, gold coins were confiscated by Executive Order 6102 under Franklin D. Roosevelt, and in 1934 the standard was changed to $35 per troy ounce fine gold, or 13.71 grains (0.888 g) per dollar.

After 1968 a series of revisions to the gold peg was implemented, culminating in the Nixon Shock of August 15, 1971, which suddenly ended the convertibility of dollars to gold. The U.S. dollar has since floated freely on the foreign exchange markets.

Federal Reserve Notes, 20th century to present[edit]

Congress continued to issue paper money after the Civil War, the latest of which is the Federal Reserve Note that was authorized by the Federal Reserve Act of 1913. Since the discontinuation of all other types of notes (Gold Certificates in 1933, Silver Certificates in 1963, and United States Notes in 1971), U.S. dollar notes have since been issued exclusively as Federal Reserve Notes.

Emergence as reserve currency[edit]

The U.S. dollar first emerged as an important international reserve currency in the 1920s, displacing the British pound sterling as it emerged from the First World War relatively unscathed and since the United States was a significant recipient of wartime gold inflows. After the United States emerged as an even stronger global superpower during the Second World War, the Bretton Woods Agreement of 1944 established the U.S. dollar as the world’s primary reserve currency and the only post-war currency linked to gold. Despite all links to gold being severed in 1971, the dollar continues to be the world’s foremost reserve currency for international trade to this day.

The Bretton Woods Agreement of 1944 also defined the post-World War II monetary order and relations among modern-day independent states, by setting up a system of rules, institutions, and procedures to regulate the international monetary system. The agreement founded the International Monetary Fund and other institutions of the modern-day World Bank Group, establishing the infrastructure for conducting international payments and accessing the global capital markets using the U.S. dollar.

The monetary policy of the United States is conducted by the Federal Reserve System, which acts as the nation’s central bank. It was founded in 1913 under the Federal Reserve Act in order to furnish an elastic currency for the United States and to supervise its banking system, particularly in the aftermath of the Panic of 1907.

For most of the post-war period, the U.S. government has financed its own spending by borrowing heavily from the dollar-lubricated global capital markets, in debts denominated in its own currency and at minimal interest rates. This ability to borrow heavily without facing a significant balance of payments crisis has been described as the United States’s exorbitant privilege.

Coins[edit]

The United States Mint has issued legal tender coins every year from 1792 to the present. From 1934 to the present, the only denominations produced for circulation have been the familiar penny, nickel, dime, quarter, half dollar, and dollar.

Denomination	Common name	Obverse	Reverse	Obverse portrait and design date	Reverse motif and design date	Weight	Diameter	Material	Edge	Circulation
Cent 1¢	penny			Abraham Lincoln (1909)	Union Shield (2010)	2.5 g (0.088 oz)	0.75 in (19.05 mm)	97.5% Zn covered by 2.5% Cu	Plain	Wide
Five cents 5¢	nickel			Thomas Jefferson (2006)	Monticello (1938)	5.0 g (0.176 oz)	0.835 in (21.21 mm)	75% Cu 25% Ni	Plain	Wide
Dime 10¢	dime			Franklin D. Roosevelt (1946)	Olive branch, torch, and oak branch (1946)	2.268 g (0.08 oz)	0.705 in (17.91 mm)	91.67% Cu 8.33% Ni	118 reeds	Wide
Quarter dollar 25¢	quarter			George Washington (1932)	Washington crossing the Delaware (2021)	5.67 g (0.2 oz)	0.955 in (24.26 mm)	91.67% Cu 8.33% Ni	119 reeds	Wide
Half dollar 50¢	half			John F. Kennedy (1964)	Presidential Seal (1964)	11.34 g (0.4 oz)	1.205 in (30.61 mm)	91.67% Cu 8.33% Ni	150 reeds	Limited
Dollar coin $1	dollar coin, golden dollar			Sacagawea (2000)	Various; new design per year	8.10 g (0.286 oz)	1.043 in (26.50 mm)	88.5% Cu 6% Zn 3.5% Mn 2% Ni	Plain 2000-2006 Lettered 2007-Present	Limited

Gold and silver coins have been previously minted for general circulation from the 18th to the 20th centuries. The last gold coins were minted in 1933. The last 90% silver coins were minted in 1964, and the last 40% silver half dollar was minted in 1970.

The United States Mint currently produces circulating coins at the Philadelphia and Denver Mints, and commemorative and proof coins for collectors at the San Francisco and West Point Mints. Mint mark conventions for these and for past mint branches are discussed in Coins of the United States dollar#Mint marks.

The one-dollar coin has never been in popular circulation from 1794 to present, despite several attempts to increase their usage since the 1970s, the most important reason of which is the continued production and popularity of the one-dollar bill.^[42] Half dollar coins were commonly used currency since inception in 1794, but has fallen out of use from the mid-1960s when all silver half dollars began to be hoarded.

The nickel is the only coin whose size and composition (5 grams, 75% copper, and 25% nickel) is still in use from 1865 to today, except for wartime 1942-1945 Jefferson nickels which contained silver.

Due to the penny’s low value, some efforts have been made to eliminate the penny as circulating coinage.
^[43]
[44]

For a discussion of other discontinued and canceled denominations, see Obsolete denominations of United States currency#Coinage and Canceled denominations of United States currency#Coinage.

Collector coins[edit]

Collector coins are technically legal tender at face value but are usually worth far more due to their numismatic value or for their precious metal content. These include:

• American Eagle bullion coins
  • American Silver Eagle $1 (1 troy oz) Silver bullion coin 1986–present
  • American Gold Eagle $5 (1⁄10 troy oz), $10 (1⁄4 troy oz), $25 (1⁄2 troy oz), and $50 (1 troy oz) Gold bullion coin 1986–present
  • American Platinum Eagle $10 (1⁄10 troy oz), $25 (1⁄4 troy oz), $50 (1⁄2 troy oz), and $100 (1 troy oz) Platinum bullion coin 1997–present
  • American Palladium Eagle $25 (1 troy oz) Palladium bullion coin 2017–present
• United States commemorative coins—special issue coins, among these:
  • $50.00 (Half Union) minted for the Panama-Pacific International Exposition (1915)
  • Silver proof sets minted since 1992 with dimes, quarters and half-dollars made of silver rather than the standard copper-nickel
  • Presidential dollar coins proof sets minted since 2007

Banknotes[edit]

Denomination	Front	Reverse	Portrait	Reverse motif	First series	Latest series	Circulation
One dollar			George Washington	Great Seal of the United States	Series 1963[b] Series 1935[c]	Series 2017A[45]	Wide
Two dollars			Thomas Jefferson	Declaration of Independence by John Trumbull	Series 1976	Series 2017A	Limited
Five dollars			Abraham Lincoln	Lincoln Memorial	Series 2006	Series 2017A	Wide
Ten dollars			Alexander Hamilton	U.S. Treasury	Series 2004A	Series 2017A	Wide
Twenty dollars			Andrew Jackson	White House	Series 2004	Series 2017A	Wide
Fifty dollars			Ulysses S. Grant	United States Capitol	Series 2004	Series 2017A	Wide
One hundred dollars			Benjamin Franklin	Independence Hall	Series 2009A[46]	Series 2017A	Wide

The U.S. Constitution provides that Congress shall have the power to «borrow money on the credit of the United States.»^[47] Congress has exercised that power by authorizing Federal Reserve Banks to issue Federal Reserve Notes. Those notes are «obligations of the United States» and «shall be redeemed in lawful money on demand at the Treasury Department of the United States, in the city of Washington, District of Columbia, or at any Federal Reserve bank».^[48] Federal Reserve Notes are designated by law as «legal tender» for the payment of debts.^[49] Congress has also authorized the issuance of more than 10 other types of banknotes, including the United States Note^[50] and the Federal Reserve Bank Note. The Federal Reserve Note is the only type that remains in circulation since the 1970s.

Federal Reserve Notes are printed by the Bureau of Engraving and Printing and are made from cotton fiber paper (as opposed to wood fiber used to make common paper). The «large-sized notes» issued before 1928 measured 7.42 in × 3.125 in (188.5 mm × 79.4 mm), while small-sized notes introduced that year measure 6.14 in × 2.61 in × 0.0043 in (155.96 mm × 66.29 mm × 0.11 mm).^[51] The dimensions of the modern (small-size) U.S. currency is identical to the size of Philippine peso banknotes issued under United States administration after 1903, which had proven highly successful.^[52] The American large-note bills became known as «horse blankets» or «saddle blankets.»^[53]

Currently printed denominations are $1, $2, $5, $10, $20, $50, and $100. Notes above the $100 denomination stopped being printed in 1946 and were officially withdrawn from circulation in 1969. These notes were used primarily in inter-bank transactions or by organized crime; it was the latter usage that prompted President Richard Nixon to issue an executive order in 1969 halting their use. With the advent of electronic banking, they became less necessary. Notes in denominations of $500, $1,000, $5,000, $10,000, and $100,000 were all produced at one time; see large denomination bills in U.S. currency for details. With the exception of the $100,000 bill (which was only issued as a Series 1934 Gold Certificate and was never publicly circulated; thus it is illegal to own), these notes are now collectors’ items and are worth more than their face value to collectors.

Though still predominantly green, the post-2004 series incorporate other colors to better distinguish different denominations. As a result of a 2008 decision in an accessibility lawsuit filed by the American Council of the Blind, the Bureau of Engraving and Printing is planning to implement a raised tactile feature in the next redesign of each note, except the $1 and the current version of the $100 bill. It also plans larger, higher-contrast numerals, more color differences, and distribution of currency readers to assist the visually impaired during the transition period.^[d]

Countries that use US dollar[edit]

Formal[edit]

Informal[edit]

Monetary policy[edit]

The Federal Reserve Act created the Federal Reserve System in 1913 as the central bank of the United States. Its primary task is
to conduct the nation’s monetary policy to promote maximum employment, stable prices, and moderate long-term interest rates in the U.S. economy. It is also tasked to promote the stability of the financial system and regulate financial institutions, and to act as lender of last resort.^[60][61]

The Monetary policy of the United States is conducted by the Federal Open Market Committee, which is composed of the Federal Reserve Board of Governors and 5 out of the 12 Federal Reserve Bank presidents, and is implemented by all twelve regional Federal Reserve Banks.

Monetary policy refers to actions made by central banks that determine the size and growth rate of the money supply available in the economy, and which would result in desired objectives like low inflation, low unemployment, and stable financial systems. The economy’s aggregate money supply is the total of

• M0 money, or Monetary Base — «dollars» in currency and bank money balances credited to the central bank’s depositors, which are backed by the central bank’s assets,
• plus M1, M2, M3 money — «dollars» in the form of bank money balances credited to banks’ depositors, which are backed by the bank’s assets and investments.

The FOMC influences the level of money available to the economy by the following means:

• Reserve requirements — specifies a required minimum percentage of deposits in a commercial bank that should be held as a reserve (i.e. as deposits with the Federal Reserve), with the rest available to loan or invest. Higher requirements mean less money loaned or invested, helping keep inflation in check. Raising the federal funds rate earned on those reserves also helps achieve this objective.
• Open market operations — the Federal Reserve buys or sells US Treasury bonds and other securities held by banks in exchange for reserves; more reserves increase a bank’s capacity to loan or invest elsewhere.
• Discount window lending — banks can borrow from the Federal Reserve.

Monetary policy directly affects interest rates; it indirectly affects stock prices, wealth, and currency exchange rates. Through these channels, monetary policy influences spending, investment, production, employment, and inflation in the United States. Effective monetary policy complements fiscal policy to support economic growth.

The adjusted monetary base has increased from approximately $400 billion in 1994, to $800 billion in 2005, and to over $3 trillion in 2013.^[62]

When the Federal Reserve makes a purchase, it credits the seller’s reserve account (with the Federal Reserve). This money is not transferred from any existing funds—it is at this point that the Federal Reserve has created new high-powered money. Commercial banks then decide how much money to keep in deposit with the Federal Reserve and how much to hold as physical currency. In the latter case, the Federal Reserve places an order for printed money from the U.S. Treasury Department.^[63] The Treasury Department, in turn, sends these requests to the Bureau of Engraving and Printing (to print new dollar bills) and the Bureau of the Mint (to stamp the coins).

The Federal Reserve’s monetary policy objectives to keep prices stable and unemployment low is often called the dual mandate. This replaces past practices under a gold standard where the main concern is the gold equivalent of the local currency, or under a gold exchange standard where the concern is fixing the exchange rate versus another gold-convertible currency (previously practiced worldwide under the Bretton Woods Agreement of 1944 via fixed exchange rates to the U.S. dollar).

International use as reserve currency[edit]

Ascendancy[edit]

The primary currency used for global trade between Europe, Asia, and the Americas has historically been the Spanish-American silver dollar, which created a global silver standard system from the 16th to 19th centuries, due to abundant silver supplies in Spanish America.^[64]
The U.S. dollar itself was derived from this coin. The Spanish dollar was later displaced by the British pound sterling in the advent of the international gold standard in the last quarter of the 19th century.

The U.S. dollar began to displace the pound sterling as international reserve currency from the 1920s since it emerged from the First World War relatively unscathed and since the United States was a significant recipient of wartime gold inflows.^[65]
After the U.S. emerged as an even stronger global superpower during the Second World War, the Bretton Woods Agreement of 1944 established the post-war international monetary system, with the U.S. dollar ascending to become the world’s primary reserve currency for international trade, and the only post-war currency linked to gold at $35 per troy ounce.^[66]

As international reserve currency[edit]

The U.S. dollar is joined by the world’s other major currencies — the euro, pound sterling, Japanese yen and Chinese renminbi — in the currency basket of the special drawing rights of the International Monetary Fund. Central banks worldwide have huge reserves of U.S. dollars in their holdings and are significant buyers of U.S. treasury bills and notes.^[67]

Foreign companies, entities, and private individuals hold U.S. dollars in foreign deposit accounts called eurodollars (not to be confused with the euro), which are outside the jurisdiction of the Federal Reserve System. Private individuals also hold dollars outside the banking system mostly in the form of US$100 bills, of which 80% of its supply is held overseas.

The United States Department of the Treasury exercises considerable oversight over the SWIFT financial transfers network,^[68] and consequently has a huge sway on the global financial transactions systems, with the ability to impose sanctions on foreign entities and individuals.^[69]

In the global markets[edit]

The U.S. dollar is predominantly the standard currency unit in which goods are quoted and traded, and with which payments are settled in, in the global commodity markets.^[70] The U.S. Dollar Index is an important indicator of the dollar’s strength or weakness versus a basket of six foreign currencies.

The United States Government is capable of borrowing trillions of dollars from the global capital markets in U.S. dollars issued by the Federal Reserve, which is itself under U.S. government purview, at minimal interest rates, and with virtually zero default risk. In contrast, foreign governments and corporations incapable of raising money in their own local currencies are forced to issue debt denominated in U.S. dollars, along with its consequent higher interest rates and risks of default.^[71]
The United States’s ability to borrow in its own currency without facing a significant balance of payments crisis has been frequently described as its exorbitant privilege.^[72]

A frequent topic of debate is whether the strong dollar policy of the United States is indeed in America’s own best interests, as well as in the best interest of the international community.^[73]

Currencies fixed to the U.S. dollar[edit]

For a more exhaustive discussion of countries using the U.S. dollar as official or customary currency, or using currencies which are pegged to the U.S. dollar, see International use of the U.S. dollar#Dollarization and fixed exchange rates and Currency substitution#US dollar.

Countries using the U.S. dollar as their official currency include:

• In the Americas: Panama, Ecuador, El Salvador, British Virgin Islands, Turks and Caicos Islands, and the Caribbean Netherlands.
• The constituent states of the former Trust Territory of the Pacific Islands: Palau, the Federated States of Micronesia, and the Marshall Islands.
• Others: East Timor.

Among the countries using the U.S. dollar together with other foreign currencies and their local currency are Cambodia and Zimbabwe.

Currencies pegged to the U.S. dollar include:

• In the Caribbean: the Bahamian dollar, Barbadian dollar, Belize dollar, Bermudan dollar, Cayman Islands dollar, East Caribbean dollar, Netherlands Antillean guilder and the Aruban florin.
• The currencies of five oil-producing Arab countries: the Saudi riyal, United Arab Emirates dirham, Omani rial, Qatari riyal and the Bahraini dinar.
• Others: the Hong Kong dollar, Macanese pataca, Jordanian dinar, Lebanese pound.

Value[edit]

Buying power of one U.S. dollar compared to 1775 Spanish milled dollar

Year   Equivalent  buying power 1775  $1.00 1780  $0.59 1790  $0.89 1800  $0.64 1810  $0.66 1820  $0.69 1830  $0.88 1840  $0.94 1850  $1.03 1860  $0.97

Year   Equivalent  buying power 1870  $0.62 1880  $0.79 1890  $0.89 1900  $0.96 1910  $0.85 1920  $0.39 1930  $0.47 1940  $0.56 1950  $0.33 1960  $0.26

Year   Equivalent  buying power 1970  $0.20 1980  $0.10 1990  $0.06 2000  $0.05 2007  $0.04 2008  $0.04 2009  $0.04 2010  $0.035 2011  $0.034 2012  $0.03

The 6th paragraph of Section 8 of Article 1 of the U.S. Constitution provides that the U.S. Congress shall have the power to «coin money» and to «regulate the value» of domestic and foreign coins. Congress exercised those powers when it enacted the Coinage Act of 1792. That Act provided for the minting of the first U.S. dollar and it declared that the U.S. dollar shall have «the value of a Spanish milled dollar as the same is now current».^[74]

The table above shows the equivalent amount of goods that, in a particular year, could be purchased with $1. The table shows that from 1774 through 2012 the U.S. dollar has lost about 97.0% of its buying power.^[75]

The decline in the value of the U.S. dollar corresponds to price inflation, which is a rise in the general level of prices of goods and services in an economy over a period of time.^[76] A consumer price index (CPI) is a measure estimating the average price of consumer goods and services purchased by households. The United States Consumer Price Index, published by the Bureau of Labor Statistics, is a measure estimating the average price of consumer goods and services in the United States.^[77] It reflects inflation as experienced by consumers in their day-to-day living expenses.^[78] A graph showing the U.S. CPI relative to 1982–1984 and the annual year-over-year change in CPI is shown at right.

The value of the U.S. dollar declined significantly during wartime, especially during the American Civil War, World War I, and World War II.^[79] The Federal Reserve, which was established in 1913, was designed to furnish an «elastic» currency subject to «substantial changes of quantity over short periods», which differed significantly from previous forms of high-powered money such as gold, national banknotes, and silver coins.^[80] Over the very long run, the prior gold standard kept prices stable—for instance, the price level and the value of the U.S. dollar in 1914 were not very different from the price level in the 1880s. The Federal Reserve initially succeeded in maintaining the value of the U.S. dollar and price stability, reversing the inflation caused by the First World War and stabilizing the value of the dollar during the 1920s, before presiding over a 30% deflation in U.S. prices in the 1930s.^[81]

Under the Bretton Woods system established after World War II, the value of gold was fixed to $35 per ounce, and the value of the U.S. dollar was thus anchored to the value of gold. Rising government spending in the 1960s, however, led to doubts about the ability of the United States to maintain this convertibility, gold stocks dwindled as banks and international investors began to convert dollars to gold, and as a result, the value of the dollar began to decline. Facing an emerging currency crisis and the imminent danger that the United States would no longer be able to redeem dollars for gold, gold convertibility was finally terminated in 1971 by President Nixon, resulting in the «Nixon shock».^[82]

The value of the U.S. dollar was therefore no longer anchored to gold, and it fell upon the Federal Reserve to maintain the value of the U.S. currency. The Federal Reserve, however, continued to increase the money supply, resulting in stagflation and a rapidly declining value of the U.S. dollar in the 1970s. This was largely due to the prevailing economic view at the time that inflation and real economic growth were linked (the Phillips curve), and so inflation was regarded as relatively benign.^[82] Between 1965 and 1981, the U.S. dollar lost two thirds of its value.^[75]

In 1979, President Carter appointed Paul Volcker Chairman of the Federal Reserve. The Federal Reserve tightened the money supply and inflation was substantially lower in the 1980s, and hence the value of the U.S. dollar stabilized.^[82]

Over the thirty-year period from 1981 to 2009, the U.S. dollar lost over half its value.^[75] This is because the Federal Reserve has targeted not zero inflation, but a low, stable rate of inflation—between 1987 and 1997, the rate of inflation was approximately 3.5%, and between 1997 and 2007 it was approximately 2%. The so-called «Great Moderation» of economic conditions since the 1970s is credited to monetary policy targeting price stability.^[83]

There is an ongoing debate about whether central banks should target zero inflation (which would mean a constant value for the U.S. dollar over time) or low, stable inflation (which would mean a continuously but slowly declining value of the dollar over time, as is the case now). Although some economists are in favor of a zero inflation policy and therefore a constant value for the U.S. dollar,^[81] others contend that such a policy limits the ability of the central bank to control interest rates and stimulate the economy when needed.^[84]

Pegged currencies[edit]

Exchange rates[edit]

Historical exchange rates[edit]

Current exchange rates[edit]

Current USD exchange rates
From Google Finance:	AUD CAD CHF CNY EUR GBP HKD JPY CAD TWD KRW
From Yahoo! Finance:	AUD CAD CHF CNY EUR GBP HKD JPY CAD TWD KRW
From XE.com:	AUD CAD CHF CNY EUR GBP HKD JPY CAD TWD KRW
From OANDA:	AUD CAD CHF CNY EUR GBP HKD JPY CAD TWD KRW

See also[edit]

• Counterfeit United States currency
• Dedollarisation
• Currency substitution
• International use of the U.S. dollar
• List of the largest trading partners of the United States
• Monetary policy of the United States
• Petrodollar recycling
• Strong dollar policy
• U.S. Dollar Index

Notes[edit]

References[edit]

Further reading[edit]

External links[edit]

• U.S. Bureau of Engraving and Printing Archived May 30, 1997, at the Wayback Machine
• U.S. Currency and Coin Outstanding and in Circulation
• American Currency Exhibit at the San Francisco Federal Reserve Bank
• Relative values of the U.S. dollar, from 1774 to present
• Historical Currency Converter
• Summary of BEP Production Statistics

Images of U.S. currency and coins[edit]

• U.S. Currency Education Program page with images of all current banknotes
• U.S. Mint: Image Library
• Historical and current banknotes of the United States (in English and German)