Dollar sign

Rupee sign Peso Unicode
Dollar sign
Other namespeso sign
In UnicodeU+0024 $ DOLLAR SIGN (HTML $ · $)
Currencymany (see dollar, peso)
Graphical variants
Dollar sign fonts.svg
Category Category

The dollar sign or peso sign ($ or Cifrão symbol.svg) is a symbol used to indicate the units of various currencies around the world, including the peso and the US dollar. The symbol can interchangeably have one or two vertical strokes. In common usage, the sign appears to the left of the amount specified, e.g. "$1", read as "one dollar".


Dollar symbol evolution
Development of the dollar sign, according to the best documented hypothesis (top) and one alternative hypothesis (bottom)

There are several hypotheses about the origin of the dollar sign. It is first attested in Spanish American, American, Canadian, Mexican, and other British business correspondence in the 1770s referring to the Spanish American peso,[1][2] also known as "Spanish dollar" or "piece of eight" in America, which provided the model for the currency that the United States adopted in 1792 and the larger coins of the new Spanish American republics, such as the Mexican peso, Peruvian real, and Bolivian sol coins. This explanation holds that the sign grew out of the Spanish and Spanish American scribal abbreviation "pˢ" for pesos. A study of late eighteenth- and early nineteenth-century manuscripts shows that the s gradually came to be written over the p, developing into a close equivalent to the "$" mark.[3][4][5][6][7] A variation of this hypothesis derives the sign from a combination of the Greek character "psi" (ψ) and "S".[8]

With the Coinage Act of 1792, the United States Congress created the US dollar, defining it to have "the value of a Spanish milled dollar as the same is now current"[9] but continued to use a variety of foreign coins until the Coinage Act of 1857 declared them illegal.[10][11] These US dollar coins did not have any dollar symbol.

Mexico continued to use the Spanish dollar until after the Mexican War of Independence.

Drawn with two vertical lines

Several alternative hypotheses relate specifically to the dollar sign drawn with two vertical lines. A dollar sign with two vertical lines could have started off as a monogram of "USA" used on money bags issued by the United States Mint.[citation needed] The letters U and S superimposed resemble the historical double-stroke dollar sign Cifrão symbol.svg. The bottom of the U disappears into the bottom curve of the S, leaving two vertical lines. Dr. James Alton James was a professor of history at Northwestern University from 1897 to 1935, and he postulated that the symbol with two strokes was an adapted design of patriot Robert Morris in 1778.[12][13]

The $1 United States Note issued by the United States in 1869 included a symbol consisting of a partially overlapping U and S, with one of the bars of the U intersecting the S, as well as the double-stroke dollar sign in the legal warning against forgery.[14] Another hypothesis is that it is derived from the symbol used on a German Thaler. A similar symbol of superimposing S and I or J was used to denote the German Joachimsthaler which appeared in the 1686 edition of An Introduction to Merchants' Accounts by John Collins.[15]

Use in computer software

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.


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

There are no separate characters for one- and two-line variants. This is typeface-dependent.

There are also 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.

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

Programming languages

Operating systems

> touch my_first_file
> echo "This is my file." > !$
where !$ expands into my_first_file.


Currencies that use the dollar or peso sign

In addition to those countries of the world that use dollars or pesos, a number of other countries use the $ symbol to denote their currencies, including:

An exception is the Philippine peso, whose sign is written as .

The dollar sign is also still sometimes used to represent the Malaysian ringgit (which replaced the local dollar), though its official use to represent the currency has been discontinued since 1993.

Some currencies use the cifrão (Cifrão symbol.svg), similar to the dollar sign, but always with two strokes:

Because the one bar version and the two bar version are allographs, any given font will contain one style or the other, not both. Furthermore, an electronic document written using one style may be viewed subsequently with the other style, because of font substitution. Consequently, when distinction is critical, it is best to use the three-letter acronym (USD, MXN etc, see ISO 4217).

However, in Argentina, the $ sign is always used for pesos, and if they want to indicate dollars, they always write U$S 5 or US$5 (5 US dollars).

In the United States, Mexico, Australia, Argentina, New Zealand, Hong Kong, Pacific Island nations, and English-speaking Canada, the dollar or peso symbol precedes the number. Five dollars or pesos is written and printed as $5, whereas five cents is written as 5¢. In French-speaking Canada, the dollar symbol usually appears after the number (5$).

In games and virtual worlds

Some virtual world and gaming platforms have used the $ symbol to refer to their own virtual currencies, for example:

Other uses

The symbol is sometimes used derisively to indicate greed or excess money such as in "Micro$oft", "George Luca$", "Lar$ Ulrich", "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 the California Governor as $tealand Landford.[18]

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.[19]

A dollar symbol is used as unit of reactivity for a nuclear reactor, 1$ being the threshold of slow criticality, meaning a steady reaction rate, while 2$ is the threshold of prompt criticality, which means a nuclear excursion or explosion.[20]

The dollar sign was used as a letter in the Turkmen alphabet from 1993 to 1999.

See also


  1. ^ Kinnaird, Lawrence (July 1976). "The Western Fringe of Revolution". The Western Historical Quarterly. 7 (3): 259. JSTOR 967081.
  2. ^ Popular Science (February 1930). "Origin of Dollar Sign is Traced to Mexico". Popular Science: 59. ISSN 0161-7370.
  3. ^ Cajori, Florian (1993) [1929]. A History of Mathematical Notations. 2. pp. 15–29.
  4. ^ Aiton, Arthur S.; Wheeler, Benjamin W. (May 1931). "The First American Mint". The Hispanic American Historical Review. 11 (2): 198. JSTOR 2506275.
  5. ^ Nussbaum, Arthur (1957). A History of the Dollar. New York: Columbia University Press. p. 56. The foreign coins remained in circulation [in the United States], and the more important among them, especially the Spanish (including the Mexican) dollars, were declared by Congress on February 9, 1793, to be legal tender. The dollar sign, $, is connected with the peso, contrary to popular belief, which considers it to be an abbreviation of 'U.S.' The two parallel lines represented one of the many abbreviations of 'P,' and the 'S' indicated the plural. The abbreviation '$.' was also used for the peso, and is still used in Argentina.
  6. ^ Riesco Terrero, Ángel (1983). Diccionario de abreviaturas hispanas de los siglos XIII al XVIII: Con un apendice de expresiones y formulas juridico-diplomaticas de uso corriente. Salamanca: Imprenta Varona. p. 350. ISBN 84-300-9090-8.
  7. ^ Bureau of Engraving and Printing. "What is the origin of the $ sign?". Resources: FAQs. Retrieved 2016-04-08.
  8. ^ Larson, Henrietta M. (October 1939). "Note on Our Dollar Sign". Bulletin of the Business Historical Society. 13 (4): 57–58. JSTOR 3111350.
  9. ^ "Section 9 of the Coinage Act of 1792". Retrieved August 24, 2010.
  10. ^ "Massachusetts Copyright Statute,(1783), p. 370".
  11. ^ "Maryland Copyright Statute (1783)".
  12. ^ James, James Alton (1970) [1937]. Robert Morris: The Life and Times of an Unknown Patriot. Freeport: Books for Libraries Press. p. 356. ISBN 978-0-8369-5527-9.
  13. ^ James, James Alton (1929). "'Robert Morris, Financier of the Revolution in the West'". The Mississippi Valley Historical Review.
  14. ^ Reverse of $1 United States Note (Greenback), series of 1869
  15. ^ Florence Edler de Roover. Concerning the Ancestry of the Dollar Sign. - Bulletin of the Business Historical Society. Vol. 19, No. 2 (Apr., 1945), pp. 63-64
  16. ^ HTML5 is the only version of HTML that has a named entity for the dollar sign, see ("The following sections present the complete lists of character entity references.") and ("dollar;").
  17. ^
  18. ^ Roy Morris (1995). Ambrose Bierce: Alone in Bad Company. Oxford University Press. p. 176. ISBN 9780195126280.
  19. ^ "Scrabble Glossary". Tucson Scrabble Club. Archived from the original on 2011-08-30. Retrieved 2012-02-06.
  20. ^ Weinberg, Alvin M.; Wigner, Eugene P. (1958). The Physical Theory of Neutron Chain Reactors. Chicago: University of Chicago Press. p. 595.