Noun
The elliptical head of a note in musical notation.
A letterhead.
Source: en.wiktionary.orgThe notehead can be placed with the center of its notehead intersecting a line (on a line), or in between the lines touching the lines above and below (in a space). Source: Internet
The vertical position of the notehead on the staff indicates which note to play: higher-pitched notes are marked higher on the staff. Source: Internet