|Unicode name||DOLLAR SIGN|
$ appears to have evolved ca 1775 in the United States from a common abbreviation for pesos, also known as piastres or pieces of eight, a P–raised S ligature PS that passed through a stage resembling ֆ. It was used in the US before the adoption of the dollar in 1785.
Derived terms 
- ﹩ (small form variant)
- (figuratively) A substitute for the letter S or a space or hyphen used as a symbol of (perceived) greedy business practices
- for example: "Micro$oft Window$"
- (programming) used to indicate a variable
- (computer science) (parsers, regexes) end of input token
Usage notes 
The symbol precedes the number it qualifies, despite being pronounced second (in English). For example, “$1” is read as “one dollar” not “dollar one”.
See also 
Formerly used currency signs