Last modified on 25 October 2014, at 19:00

Unsupported titles/Number sign

See also:
Character #
Unicode name NUMBER SIGN
Code point U+0023
Unicode block Basic Latin
" [U+0022] [U+0024] $




  1. (set theory) The cardinality of a set.
    #{ 5, 3, 7, 11 } = 4
  2. (computing) The hash character
  3. (mathematics, computer science) concatenation
  4. Alternative form of .
  5. (chess notation) checkmate
  6. (television) Used in subtitles to indicate that the enclosed text is song lyrics
  7. (Usenet) Used to pad the left side of a quotation from a manual or official source.
  8. (cartography) Used to denote a village.
  9. (syntax) Used to indicate that a sentence is grammatical but semantically strange.
  10. (phonology) Used to indicate a word boundary.

Derived termsEdit

  • (small form variant)

Coordinate termsEdit

  • (to pad a quotation on Usenet): > (for a quotation not necessarily from a manual or official source)

Usage notesEdit


  • (chess): ++



The symbol # derives from the abbreviation lb for Latin libra (pound), via the medieval convention of indicating abbreviations with a bar, .


# (plural # or #s)

  1. (food packaging, US) Pound (unit of weight)
    3# — "three pounds"
  2. (followed by a numeral: used attributively) Number
    #3 — "number three"

Related termsEdit


  • (number): no.

See alsoEdit