from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. Abbreviation of peso.
- n. Abbreviation of dollar.
- n. A substitute for the letter S or a space or hyphen used as a symbol of (perceived) greedy business practices
- n. used to indicate a variable
- n. (parsers, regexes) end of input token
$ 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. (Wiktionary)