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

Exclamation Mark Media

Trilingual billboard in Barcelona (detail), showing the initial exclamation mark for Spanish, but not for Catalan (top line) and English
Road sign marking the entrance to Westward Ho!
Warning signs are often an exclamation mark enclosed within a triangle.
New Zealand road sign warning of a "cattle stop" (cattle grid/cattle guard)
Custom cut tri-color PVC stands representing different styles of an exclamation mark
Aalto University School of Business Logo 2020 (exclamation mark)

Related pages

References

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

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[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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