# X vs XP

> English confusable word pair

## The two words

### X
*num · IPA /ɛks/ · frequency rank #647*
An unknown quantity or unknown value.

### XP
*noun · frequency rank #11,823*
Initialism of extreme programming.

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