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"$" redirects here. For other uses, see $ (disambiguation).
For technical reasons, :$ redirects here. See emoticon
The dollar sign or peso sign ($) is a symbol primarily used to indicate a unit of currency.
[edit] OriginThe sign is attested in business correspondence between British North America and Mexico in the 1770s, as referring to the Spanish-Mexican peso.[1] known as "Spanish dollar" or "pieces of eight" in British North America where it was adopted as U.S. currency in 1785, together with the term "dollar" and the $ sign. The origin of the "$" sign has been variously accounted for. Perhaps the most widely accepted explanation is that it is the result of the evolution of the Spanish-Mexican "P's" for pesos or Spanish dollar. This theory, derived from a study of old manuscripts, explains that the "S," gradually came to be written over the "P," developing a close equivalent to the "$" mark."[2][3] 
[edit] Alternate hypothesesThere are a number of other theories about the origin of the symbol, some with a measure of academic acceptance, others the symbolic equivalent of folk etymologies. [edit] Slash 8That the dollar sign is derived from a slash through the numeral eight, denoting pieces of eight. The Oxford English Dictionary before 1963 held that this was the most probable explanation, though later editions have placed it in doubt. [edit] Potosi mint markThat the dollar sign was derived from or inspired by the mint mark on the Spanish "pieces of eight" that were minted in Potosí (in present day Bolivia). The mint mark was composed of the letters "PTSI" superimposed on one another and bear an undeniable resemblance to the single-stroke dollar sign (see above photo). The mark, which appeared on silver coins minted from 1573 to 1825 in Potosí, the largest mint during the colonial period, would have been widely recognized throughout the North American colonies. [edit] Spanish coat of armsThat the dollar sign derives from the Spanish coat of arms engraved on the Spanish colonial silver coins. The Spanish coat of arms on the coins includes two columns, the Pillars of Hercules and a small "S"-shaped ribbon around each, with the motto "Plus Ultra".[4] [edit] From 'US'That $ is a monogram of U. S., used on money bags issued by the United States Mint. The letters U and S superimposed resemble the historical double stroke "$" sign: the bottom of the 'U' disappears into the bottom curve of the 'S', leaving two vertical lines. This theory, popularized by novelist Ayn Rand in Atlas Shrugged [5], does not consider the fact that the symbol was already in use before the formation of the United States. [edit] "Unit of silver"That it derives from "unit of silver", each unit being one "bit" of the "pieces of eight". Before the American Revolution, prices were often quoted in units of the Spanish dollar. According to this theory, when a price was quoted the capital 'S' was used to indicate silver with a capital 'U' written on top to indicate units. Eventually the capital 'U' was replaced by double vertical hash marks. [edit] German ThalerThat it derives from the symbol used on a German Thaler. According to Ovason (2004), on one type of thaler one side showed the crucified Christ while the other showed a serpent hanging from a cross, the letters NU near the serpent's head, and on the other side of the cross the number 21. This refers to the Bible, Numbers, Chapter 21 (see Nehushtan). [edit] Roman sestertiusThat the dollar sign goes back to the most important Roman coin, the sestertius, which had the letters 'HS' as its currency sign. When superimposed these letters form a dollar sign with two vertical strokes (the horizontal line of the 'H' merging into the 'S'). [edit] Greek mythologyThat the dollar sign may have also originated from Hermes, the Greek god of bankers, thieves, messengers, and tricksters: Besides the crane, one of his symbols was the caduceus, a staff from which ribbons or snakes dangled in a sinuous curve. [edit] Pillars in the temple of SolomonThat the two vertical lines represent the two cult pillars Boaz and Jachin in the original Temple of Solomon at Jerusalem. This is based on the idea that Masonic symbols, such as the All Seeing Eye of God, appear on U.S. currency, although they did not in 1785. [edit] Later history of the dollar signAccording to a plaque in St Andrews, Scotland, the dollar sign was first cast into type at a foundry in Philadelphia in 1797 by the Scottish immigrant John Baine. 
The dollar sign did not appear on U.S. currency until February 2007, when it was used on the reverse of a $1 coin authorized by the Presidential $1 Coin Act of 2005.[6] [edit] Use in computer programmingAs the dollar sign is one of the few symbols that is on the one hand almost universally present in computer character sets, but on the other hand rarely needed in its literal meaning within programming languages, the $ character has been used on computers for many purposes not related to money, including:
[edit] Currencies that use the dollar or peso signIn 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:
Except the Philippine peso, whose sign is written as Some currencies use the cifrão The cifrão is also used to account for over 130,000,000 domestic standard US Mint (1986+) bullion US silver dollars as one dollar per one troy ounce fine (99.9%), thereby avoiding confusion with debased US trade dollar-denominated tokens and Federal Reserve Notes.[citation needed] [edit] See also[edit] References
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, similar to the dollar sign, but always with two strokes: