Ems and Ens
A dash is a dash right? They’re all the same. To most people this is true, however in the world if typography (and English even), this is not the case.
There’s s difference between an em and en dash, and it’s a bit more obvious than you would think. It’s just what it sounds like.
The En dash, pronounced “N dash” is the shorter of the two, obviously making the “M (em) dash” longer.
Lets take a look at the letters they are named from, N and M. The letter N is shorter than the length of the letter M, just like the en and em dash.
That’s why the dashes are named the way they are.