Exclamation mark
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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, ).[2][3][4]