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# Exclamation mark

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, $n!$).[2][3][4]

## References

1.
2. "Compendium of Mathematical Symbols" (in en-US). 2020-03-01.
3. Weisstein, Eric W.. "Factorial" (in en).