Open notehead

An open notehead with a stem forms a half note; an open head without a stem forms a whole note. The head alone therefore does not fix the duration, and its staff position normally determines pitch.

Open notehead: music notation symbol drawn on the staff. An open head means a half note or longer.
Family
Notes and rests
Where it sits
On the staff itself
What it looks like
An oval or notehead

Do not confuse it with

A filled notehead is solid black and is used for quarter notes and shorter values.

What the sources say

All notation signs

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