# X vs XO

> English confusable word pair

## The two words

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

### XO
*noun · frequency rank #24,641*
Alternative letter-case form of xo (“hugs and kisses”).

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