And the $ is used only in the USA...
The vocal minority representing Thai refuses to accept sharing.
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:
Nicaraguan córdoba (usually written as C$)
Samoan tālā (a transliteration of the word dollar)
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 .
Some currencies use the cifrão , similar to the dollar sign, but always with two strokes:
Cape Verde escudo
Portuguese escudo (defunct)
The cifrão is also used to account for over 130,000,000 domestic standard U.S. Mint (1986+) bullion U.S. silver dollars as one dollar per one troy ounce fine (99.9%), thereby avoiding confusion with debased U.S. trade dollar-denominated tokens and Federal Reserve notes.
In Mexico and another peso-using countries, the cifrão is used as a dollar sign when a document uses pesos and dollars at the same time, to avoid confusions, but, when it used alone, usually is represented as US $ (United States dollars). Example: US $5 (five US dollars).
In the United States, Mexico, Australia, New Zealand, Hong Kong, Pacific Island nations, and English-speaking Canada, the dollar or peso symbol precedes the number, unlike most currency symbols. 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, although it sometimes appears in front of it, or instead may even be totally absent.
That is not even getting into the whole section of $ in programming languages http://en.wikipedia.org/wiki/Dollar_sign