# M3 vs MM

> English confusable word pair

## The two words

### M3
*noun · frequency rank #17,404*
an ISO metric screw thread size for screws with a nominal outer diameter of 3 millimetres

### MM
*noun · frequency rank #2,262*
Initialism of Master of Music.

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-09-03.
Canonical page: https://plainspell.com/en/vs/m3-vs-mm