# M3 vs MB

> 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

### MB
*symbol · frequency rank #9,916*
Abbreviation of megabyte.

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/vs/m3-vs-mb