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An '''exclamation mark''' (!) is used at the end of a [[sentence]] to express surprise, disgust, admiration, etc., or to add emphasis to a command.

An '''exclamation mark''' or '''exclamation point''' ('''!''') is used at the end of a [[sentence]] to express surprise, disgust, admiration, etc., or to add emphasis to a command.

In [[C]] and similar computer programming languages, it is used to represent "logical not" and in a pair with an equals sign (=) to represent ''is not equal to'', e.g. {{tt|1=if (a != b)}} means ''if a is not equal to b''.<ref>[http://cermics.enpc.fr/~ts/C/CONCEPT/expressions.html C Operators/Expressions].</ref>

In [[C]] and similar computer programming languages, it is used to represent "logical not" and in a pair with an equals sign (=) to represent ''is not equal to'', e.g. {{tt|1=if (a != b)}} means ''if a is not equal to b''.<ref>[http://cermics.enpc.fr/~ts/C/CONCEPT/expressions.html C Operators/Expressions].</ref>