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Number sign

Punctuation marks
apostrophe (' ) parentheses ( ( ) ), brackets ( [ ] ); ( { } ); ( < > ) colon ( : ) comma ( , ) dash ( ‒ ); ( – ); ( — ); ( ― ) ellipsis ( … ) ( ... ) exclamation mark ( ! ); ( ¡ ! ) full stop/period ( . ) hyphen ( - ); ( ‐ ) interrobang ( ‽ ) question mark ( ? ); ( ¿ ? ) quotation marks ( ‘ ’ ); ( “ ” );     ( ‚ ’ ); ( „ ” ); ( ‚ ‘ ); ( „ “ );     ( ‹ › ); ( « » ); ( › ‹ ); ( » « );     ( 「 」 ); ( 『 』 ) semicolon ( ; ) slash ( / ) and backslash ( \ ) space (   ) and interpunct ( · )
ampersand ( & ) asterisk ( * ) and dagger ( † ‡) bullet ( •, more ) commercial at ( @ ) number sign ( # ) prime ( ′ ) and double prime (″) tilde ( ~ ) underscore ( _ ) vertical bar / pipe ( | )

Number sign is the Unicode preferred name for the glyph or symbol #.

It is so used in the United States and Canada, where No. would be used in the United Kingdom (and also Canada since the influence comes from both directions).

The number sign's Unicode value is 0023 in hexadecimal and its ASCII value is 23 in hexadecimal.

It has many other names (and uses) in English. (Those in bold are listed as alternative names in the Unicode documentation.)

• comment sign
  • from its use in some programming languages, e.g. Perl, to introduce comment text
• crosshatch
  • resemblance
• crunch
  • ?
• fence, gate, grid, gridlet
  • resemblance
• hash / hash mark / hash sign
  • the most common name outside the US, including in the UK and Australia
  • Used in the UK and Australia on touch-tone telephones – "Please press the hash key!"
• hex
  • from its use to denote hexadecimal values in some markup and programming languages
• octothorn
  • William Sherk in 500 Years of New Words (1983), p. 272, has the following entry: "Octothorn, The number sign (#); so called because there are eight points, or thorns, sticking out of it ... ."
• octalthorpe / octothorp / octothorpe
  • See wiktionary:Octothorpe for etymology.
• pig pen
  • resemblance
• pound / pound sign
  • Used as the symbol for the pound avoirdupois in the U.S. (where lb. would be used in the UK and Canada). Never called 'pound' in the UK, where the term denotes the pound sterling and its symbol (£).
    • Keith Gordon Irwin in, The Romance of Writing, p. 125 says: "The Italian libbra (from the old Latin word libra, "balance") represented a weight almost exactly equal to the avoirdupois pound of England. The Italian abbreviation of lb with a line drawn across the letters was used for both weights. The business clerk's hurried way of writing the abbreviation appears to have been responsible for the # sign used for pound."
  • Used in the U.S. and Canada on touch-tone telephones – "Please press the pound key!"
• sharp
  • resemblance to the glyph used in music notation; so called in the name of Microsoft's new programming language, C#. However Microsoft says at :
    It's not the "hash" (or pound) symbol as most people believe. It's actually supposed to be the musical sharp symbol. However, because the sharp symbol is not present on the standard keyboard, it's easier to type the hash ("#") symbol. The name of the language is, of course, pronounced "see sharp".
    Since most fonts don't contain the sharp sign most websites will doubtless continue to use the fallback hash mark. The "music sharp sign" which should be used if available is U+266F (♯). (However, in French the # key on a telephone is called la dièse.)
• square
  • often misattributed as the UK name for #, in reference to touch-tone telephones. It has never been known as 'square'. From the earliest days of # appearing on telephones, it has been called 'hash'.
• tic-tac-toe (US) / noughts-and-crosses (UK)
  • resemblance to game board
• widget mark

In a URL the sign is used between the URL of a webpage and a "name" or "id" which defines a position in that webpage, by means of the attribute in a HTML element. A reference from the page itself can start with the number sign, and dispense with the URL of the page.

The pronunciation of # as 'pound' is common in the US which can cause confusion. The British Commonwealth has its own, rather more apposite, use of `pound sign. On British keyboards the UK pound currency symbol often replaces #, with # being elsewhere on the keyboard. The US usage derives from an old-fashioned commercial practice of using a # suffix to tag pound weights on bills of lading. The character is usually pronounced 'hash' outside the US.

In Hebrew, called:

• sulamit (from sulam == 'ladder' + -it, feminine ending)

In Portugal, called:

• cardinal

In Germany, called:

• Lattenzaun (picket fence), Doppelkreuz (double cross), Raute or Rautenzeichen (the official name used by telcos for touch-tone key)

In Denmark, called:

• firkant (square), the official name used by telcos for touch-tone key, or havelåge (garden gate from the gate in a picket fence)

See also

• Numero sign

References (as numbered above)

1. Weird Words
   • Entry for this symbol: <http://www.quinion.com/words/weirdwords/ww-oct1.htm > - valid 22nd of May 2003
2. World Heritage Dictionary
   • Entry for this symbol: <http://www.bartleby.com/61/88/O0028850.html > - valid 22nd of May 2003