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] In IPA is a alveolar click.

Not to be confused with I.
An exclamation mark.

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, ).[2][3][4]

References
  1. "Exclamation Point (or Exclamation Mark)". Grammarly. 2016-02-09. Retrieved 2020-10-17.
  2. "Compendium of Mathematical Symbols". Math Vault. 2020-03-01. Retrieved 2020-09-10.
  3. "Factorial Function !". www.mathsisfun.com. Retrieved 2020-09-10.
  4. Weisstein, Eric W. "Factorial". mathworld.wolfram.com. Retrieved 2020-09-10.
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