! is a punctuation mark called an exclamation mark, exclamation point, ecphoneme, or bang.

! may also refer to:

Mathematics and computers

• Factorial, a mathematical function
  • Derangement, a related mathematical function
• Negation, in logic and some programming languages
• Uniqueness quantification in mathematics and logic

Music

• ! (album), a 1995 album by The Dismemberment Plan
• !!! (Chk, chk, chk), an American dance-punk band
• "! (The Song Formerly Known As)", a single on the album Unit by Regurgitator

Other

• the IPA symbol for postalveolar click in speech
• An indicator of a good chess move in punctuation
• A dereference operator in BCPL

See also

• !! (disambiguation)
• Interrobang, the nonstandard mix of a question mark and an exclamation mark

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