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The pound sign () is the for the pound unit of – the of the 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 and 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 (). In Canada, "pound sign" can mean or .


Origin
The symbol derives from the upper case , representing libra pondo, the basic unit of weight in the , which in turn is derived from the word libra, meaning or a balance. The pound became an English unit of weight and in England became defined as the tower pound (equivalent to 350 grams) of . According to the Royal Mint Museum:

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 type used until the seventeenth century, the letter L is rendered as \mathfrak{L}.


Usage
When used for sterling, the pound sign is placed before the numerals (e.g., £12,000) and separated from the following digits by no space or only a . In the UK, the sign is used without any prefix. In and , a disambiguating letter is added ( or £E and respectively). In international banking and operations, the symbol is rarely used: the ISO 4217 currency code (e.g., GBP, EGP, etc.) is preferred.


Other English variants
In , the symbol is called the pound sign. The symbol has several uses and is sometimes called the pound sign too, though it is most often known as the number sign.
(2025). 9780195418163, Oxford University Press.
(Telephone instructions for equipment manufactured in the United States often call the pound key.)

In , the term "pound sign" usually refers to the symbol (), and the corresponding telephone key is called the "pound key". (As in Canada, the # symbol has many .)


Historic variants

Double bar style
Banknotes issued by the Bank of England since 1975 have used only the single bar style as a pound sign. ("£1 1st Series Treasury Issue" to "£5 Series B") The bank used both the two-bar style () and the one-bar style () (and sometimes a figure without any symbol whatever) more or less equally from 1725 to 1971 intermittently and sometimes concurrently. In , the symbols are style choices when used to represent the pound; consequently fonts use () irrespective of which style chosen, (not despite its similarity). It is a choice on how to draw the symbol at U+00A3. Although most do so with one bar, the two-bar style is not rare, as may be seen in the illustration above.


Other
In the eighteenth-century metal fonts, the pound sign was identical to an italic uppercase J, rotated 180 degrees.


Currencies that use the pound sign


Former currencies


Use with computers
In the standard, the pound sign is encoded at Whether the glyph is drawn with one or two bars is a 's choice as explained above; the key point is that the code is constant irrespective of the presentation chosen.

The encoding of the £ symbol in position xA3 (16310) was first standardised by ISO Latin-1 (an "") in 1985. Position xA3 was used by the Digital Equipment Corporation VT220 terminal, Mac OS Roman, , , and .

Many early computers (limited to a 7-bit, 128-position ) used a variant of 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 () instead of (). on the 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 also used position x9C. The used position xBA (ISO/IEC 8859-1: ) for the £ symbol, while most other printers used x9C. The BBC system which dated from 1976 encoded the £ as x23. The Sinclair ZX80 and ZX81 characters sets used x0C (ASCII: ). The and the used x60 (ASCII: , grave). The Commodore 64 used x5C (ASCII: ) while the used x5F (ASCII: ). 's 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 23 (hex 13, dec 19).


Other uses
The logo of the UK Independence Party, a British , is based on the pound sign, symbolising the party's opposition to adoption of the and to the generally.

The pound sign was used as an uppercase letter (the lowercase being , ) to signify the sound in the early 1993–1995 version of the .


See also


Notes
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