<Tr> <Td_colspan="2"> <Ul> <Li> </Li> <Li> </Li> <Li> </Li> </Ul> </Td> </Tr> <Ul> <Li> </Li> <Li> </Li> <Li> </Li> </Ul> <P> The dash is a punctuation mark that is similar in appearance to a hyphen or minus sign, but differs from both of these symbols primarily in length and function . The most common versions of the dash are the en dash (--) and the longer em dash (--), whose names historically were loosely related with the length of a lower - case n and upper - case M, respectively, in commonly used typefaces . </P> <P> Usage varies both within English and in other languages, but the usual convention in printed English text is as follows: </P>

How did the em dash get its name
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