that application. For example Draw$Dir specifies the directory where the !Draw application is located. It is also used to refer to the root directory of a file system. Applications Microsoft Excel and other spreadsheet software use the dollar sign ($) to denote a fixed row, fixed column reference, or an absolute cell reference. The dollar sign introduces a subfield delimiter in computer coding of library catalog records. matches the end of a line or string in sed, grep, and POSIX and Perl regular expressions, as well as the end of a line or the file in text editors ed, ex, vi, pico, and derivatives. Other uses The symbol is sometimes used derisively, in place of the letter S, to indicate greed or excess money such as in "Micro$oft", "Di$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 California governor Leland Stanford as $tealand Landford. In Scrabble notation, a dollar sign is placed after a word to indicate that it is valid according to the North American word lists, but not according to the British word lists. A dollar symbol is used as unit of reactivity for a nuclear reactor, being the threshold of slow criticality, meaning a steady reaction rate, while is the threshold of prompt criticality, which means a nuclear excursion or explosion. The dollar sign was used as a letter in the Turkmen alphabet from 1993 to 1999. The dollar sign plays an important role in the plot of Ayn Rand's novel Atlas Shrugged, with the book's radical Free Market activists adopting it as their insignia. See also Cifrão Euro sign Indian rupee sign Pound sign Ruble sign Rupee sign Spanish dollar Turkish lira sign Yen sign Yuan sign Won sign Explanatory notes References Citations General and cited sources Contains section on the history of the dollar sign, with much documentary evidence supporting the "pesos" hypothesis. External links Currency symbols Numismatics eu:$