Exclamation point
This is an old revision of this page, as edited by Dalek (talk | contribs) at 20:31, April 14, 2008. It may differ significantly from current revision.
An exclamation point refers to the ! symbol. It is used for emphasis, although in formal writing, its use is generally limited. In mathematics, the exclamation point means "factorial", and can be placed after integers to indicate the multiplication of that integer by all preceding positive integers . For instance, 5! can be read as "5 factorial", which means "5 times 4 times 3 times 2 times 1". 0! is defined to be 1.