The em dash. Named for its width, which is approximately that of the letter “m.” Should be named for Emily Dickinson, because dashes were her thing.
Never to be confused with the hyphen or the en dash (above). Never EVER to be written as double hyphens, which look ugly as all hell.
Here’s Grammarly again:
The em dash can be used in place of a colon, commas, and parentheses.
I have two pets—a dog and a cat. —> Dash used in place of a colon.
My two pets—a dog and a cat—are quite rambunctious. —> You could replace the dashes with commas or parentheses.
Double em dashes mark a phrase off as an aside, as in the second example above; a single em dash tends to introduce a phrase with a certain dramatic or ironic flair.
“My name’s Bond—James Bond.”
“Your haircut? Yeah, it looks—interesting.”
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