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

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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