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Exclamation mark




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An exclamation mark.

An exclamation mark (!) is a punctuation mark. It is used to show strong emotion at the end of a sentence or after an interjection.[1]

Putting a space before an exclamation mark is incorrect.

In coding, "!" sometimes means not. In mathematics, the use of an exclamation mark can be used for the factorial function (for example, [math]n![/math]).[2][3][4]

Related pages

References

  1. "Exclamation Point (or Exclamation Mark)" (in en). 2016-02-09. https://www.grammarly.com/blog/exclamation-mark/. 
  2. "Compendium of Mathematical Symbols" (in en-US). 2020-03-01. https://mathvault.ca/hub/higher-math/math-symbols/. 
  3. "Factorial Function !". https://www.mathsisfun.com/numbers/factorial.html. 
  4. Weisstein, Eric W.. "Factorial" (in en). https://mathworld.wolfram.com/Factorial.html.