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]

History

The exclamation mark is made by putting a vertical line over a period. It is thought that it came from the Latin exclamation io, which shows joy. Over time, the I got put above the o and later the o became a dot.

Uses

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!
A hazard warning sign with an exclamation mark.
New Zealand road sign warning of a "cattle stop" (cattle grid/cattle guard)
Zirkel of Corps Hubertia Freiburg

Related pages

References

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

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[1] Exclamation Point (or Exclamation Mark) (in en). Grammarly (2016-02-09). Retrieved 2020-10-17.

[2] Compendium of Mathematical Symbols (in en-US). Math Vault (2020-03-01). Retrieved 2020-09-10.

[3] Factorial Function !. www.mathsisfun.com. Retrieved 2020-09-10.

[4] Weisstein, Eric W.. Factorial (in en). mathworld.wolfram.com. Retrieved 2020-09-10.

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