There are two types of dash. The en dash is approximately the length of the letter N, and the em dash the length of the letter M. The shorter en dash (–)
Opus Design infographic explains hyphens, en-dashes and em-dashes
En Dash (En Rule) – When To Use It (With Examples)
Em dash versus en dash, oh my! - Susan Weiner Investment Writing
Em Dash vs. En Dash: Complete Guide
What is an Em dash and how to use it?
Em Dash vs. En Dash: Complete Guide
When and How To Use an Em Dash ( — )
Em Dash vs. En Dash — Differences, Uses, and Examples
Em Dashes vs. En Dashes: How to Use Each