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. 

 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, ).

Related pages

 Ampersand
 Interjection
 Punctuation
 Question mark
 Quotation mark

 References 

Category:Punctuation