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.

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, ${\displaystyle n!}$).^[2][3][4]

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.