The pound sign () is the currency symbol for the pound unit of Pound sterling – the currency of the United Kingdom and its associated Crown Dependencies and British Overseas Territories and previously of Great Britain and of the Kingdom of England. The same symbol is used for other currencies called pound, such as the Egyptian pound and Syrian pound pounds. The sign may be drawn with one or two bars depending on personal preference, but the Bank of England has used the one-bar style exclusively on banknotes since 1975.
In the United States, "pound sign" refers to the symbol (number sign). In Canada, "pound sign" can mean or .
However, the simple letter L, in lower- or uppercase, was used to represent the pound in printed books and newspapers until well into the 19th century.For example, Then I went to Mr. Crew's and borrowed L10 of Mr. Andrewes for my own use, and so went to my office, where there was nothing to do. In the blackletter type used until the seventeenth century, the letter L is rendered as .
In American English, the term "pound sign" usually refers to the symbol (number sign), and the corresponding telephone key is called the "pound key". (As in Canada, the # symbol has many number sign.)
The encoding of the £ symbol in position xA3 (16310) was first standardised by ISO Latin-1 (an "extended ASCII") in 1985. Position xA3 was used by the Digital Equipment Corporation VT220 terminal, Mac OS Roman, Amstrad CPC, Amiga, and Acorn Archimedes.
Many early computers (limited to a 7-bit, 128-position character set) used a variant of ASCII with one of the less-frequently used characters replaced by the £. The UK national variant of ISO 646 was standardised as BS 4730 in 1985. This code was identical to ASCII except for two characters: x23 encoded instead of , while x7E encoded (overline) instead of (tilde). MS-DOS on the IBM PC originally used a proprietary 8-bit character set Code page 437 in which the £ symbol was encoded as x9C; adoption of the ISO/IEC 8859-1 ("ISO Latin-1") standard code xA3 only came later with Microsoft Windows. The Atari ST also used position x9C. The HP LaserJet used position xBA (ISO/IEC 8859-1: ) for the £ symbol, while most other printers used x9C. The BBC Ceefax system which dated from 1976 encoded the £ as x23. The Sinclair ZX80 and ZX81 characters sets used x0C (ASCII: form feed). The ZX Spectrum and the BBC Micro used x60 (ASCII: , grave). The Commodore 64 used x5C (ASCII: ) while the Oric computers used x5F (ASCII: ). IBM's EBCDIC code page 037 uses xB1 for the £ while its code page 285 uses x5B. ICL's 1900-series mainframes used a six-bit (64-position character set) encoding for characters, loosely based on BS 4730, with the £ symbol represented as octal 23 (hex 13, dec 19).
The pound sign was used as an uppercase letter (the lowercase being , long s) to signify the sound in the early 1993–1995 version of the Turkmen alphabet.
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