Unsupported titles/`num`

See also: ⋕, ♯, ǂ, 井, and Appendix:Variations of the number sign

Text style	Emoji style
#︎	#️
Text style is forced with ⟨︎⟩ and emoji style with ⟨️⟩.
also #
# U+0023, # NUMBER SIGN ← " [U+0022] Basic Latin $ → [U+0024]

Character variations

﹟ U+FE5F, ﹟ SMALL NUMBER SIGN ← ﹞ [U+FE5E] Small Form Variants ﹠ → [U+FE60]

＃ U+FF03, ＃ FULLWIDTH NUMBER SIGN ← ＂ [U+FF02] Halfwidth and Fullwidth Forms ＄ → [U+FF04]

Translingual

A # used on a telephone keypad

Symbol

# (English symbol name number sign or hash or pound sign or octothorpe)

1. (computing) The hash character.
3. (Internet) A hashtag, which is a metadata tag for use in microblogging and social network services, used to label and search content.
4. (cartography) Used to denote a village.
5. (chess notation) Used to denote checkmate.

   Synonym: ++

6. (medicine, shorthand) Used to denote a bone fracture.

   #NOF ― fractured neck of femur

7. (mathematics, computer science) Used to indicate string concatenation.

   $1\#2=12$

8. (mathematics) Apartness, a binary relation such that if a#b, then any other element c is apart from at least one of a,b. See apartness relation.
9. (mathematics) Primorial.

   Coordinate term: ! (“factorial”)

   $12\#=2\times 3\times 5\times 7\times 11=2310$

10. (set theory) The cardinality of a set.

    $\#\{5,3,7,11\}=4$

    Synonyms: card, | |

11. (linguistics) Used to indicate that a sentence is grammatical but semantically strange.

    #Jane is a great hostess and John is too.

    #I slept a wink last night.

    #Colorless green ideas sleep furiously.

12. (phonology) Used to indicate a word boundary.

    d → t / _# ― /d/ devoices to [t] before a word boundary

13. (sign language linguistics) Used to indicate a lexicalized sign.
14. (Usenet) Used to pad the left side of a quotation from a manual or official source.

    Coordinate term: >

15. Alternative form of ‡.
16. Alternative form of ⌗ (“key available on telephone keypads”).
17. (music) Alternative form of ♯ (“sharp”).

Derived terms

• #
• # (English)
• C# (English)
• eq # (English)
• hr # (English)

English

Etymology

Derived from the abbreviation lb for Latin libra (“pound”), via the medieval convention of indicating abbreviations with a bar, ℔.

Noun

# (plural # or #s)

1. (US, food packaging) Pound (unit of weight).

   3# ― three pounds

2. (attributive, precedes a numeral) Number.

   Synonym: no.

   #3 ― number three

3. (Internet slang, text messaging) Number.
   • 1986 December 14, Ben Robbins, “Operator Denies Request For Gay Phone #”, in Gay Community News, volume 14, number 22, page 2:
   • 1997 June 17, RYankowski [username], “Why collect new U.S.?”, in rec.collecting.stamps‎^[1] (Usenet):

     I have collected U.S. Stamps since I was a boy back in the 1950's. At that time there was a low # being printed and it was affordable.

4. (Scrabble) In English-language Scrabble, indicates that a word is only found in the British accepted word list and not the North American list.

   PTERION#

Related terms

• £

Further reading

• Number sign on Wikipedia.Wikipedia

Chinese

Alternative forms

• (superscript) ^#

Pronunciation

• Mandarin

  (Pinyin): hào

  (Zhuyin): ㄏㄠˋ

---

• Mandarin
  • (Standard Chinese)⁺
    • Hanyu Pinyin: hào
    • Zhuyin: ㄏㄠˋ
    • Tongyong Pinyin: hào
    • Wade–Giles: hao⁴
    • Yale: hàu
    • Gwoyeu Romatzyh: haw
    • Palladius: хао (xao)
    • Sinological IPA ^(key): /xɑʊ̯⁵¹/
      
  • (Standard Chinese, erhua-ed)⁺
    • Hanyu Pinyin: hàor
    • Zhuyin: ㄏㄠˋㄦ
    • Tongyong Pinyin: hàor
    • Wade–Giles: hao⁴-ʼrh
    • Yale: hàur
    • Gwoyeu Romatzyh: hawl
    • Palladius: хаор (xaor)
    • Sinological IPA ^(key): /xaʊ̯ɻʷ⁵¹/

Noun

#

1. (Mainland China) Alternative form of 號 / 号 (“number”), used after a numeral.