Most fonts are equipped with at least two dashes: an en dash (-, -, which is the width of a lowercase "n") and an em dash (-, -, which is the width of a lowercase "m").

The en dash is also used to indicate ranges of Numbers (such as "7-10 days"), although it isn't flanked by Spaces in this case.

Because the replacement text for - is a character reference, it's exactly the same as typing an en dash character.