a dash one em long.
How To Use The Em DashEm Dash: What is it and how do you use it? An em dash is a punctuation mark that can be used in many ways. What about the en dash vs em dash?
What Are En Dashes?You don’t hear as much about them as other dashes, but you’ve most likely seen them around. En dashes (–) can denote a range or connect the endpoints of a route. They can also show a contrast or connection between two words. You can use them to replace the words to, and, or versus. An en dash is longer than a hyphen (–) and shorter …
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Examples from the Web for em dash
Inserted second em-dash in the index entry for "Mont Blanc:" "— —, second ascent of."The Glaciers of the Alps|John Tyndall
British Dictionary definitions for em dash
printing a dash (—) one em long
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012