X notehead (unpitched / spoken)

An X notehead calls for an unpitched or indefinite-pitch sound while preserving the written rhythm. It can mean percussion, speech or a specified noise; the instrument, nearby text or a notation key determines which sound.

X notehead (unpitched / spoken): music notation symbol drawn on the staff. Unpitched: a spoken note, a rim, a scrape.
Family
Notes and rests
Where it sits
On the staff itself
What it looks like
A cross or plus

Do not confuse it with

A double sharp is an X-shaped accidental placed before a normal notehead; an X notehead replaces the notehead itself.

What the sources say

All notation signs

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