The exclamation mark (British English and Commonwealth English) or exclamation point (American English) is a punctuation mark usually used after an interjection or exclamation to indicate strong feelings or high volume (shouting), shows emphasis and often marks the end of a sentence. Example: "Watch out!" Similarly, a bare exclamation mark (with nothing before or after) is often used in warning signs.
Other uses include:
In mathematics it denotes the factorial operation.
Several computer languages use "!" at the beginning of an expression to denote logical negation: e.g. "!A" means "the logical negation of A", also called "not A".
Some languages use "!" to denote a click consonant.
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