Assertion: fret | /r/HasProperty | perpendicular
Facets:
value: generally
type: DEGREE
value: to the instrument's neck centerline
type: OTHER
Source sentences:
text: Fan frets (also fanned frets, slanted frets), or multi-scale: while frets are generally perpendicular to the instrument's neck centerline and parallel to each other, on a "fanned" fretboard, the frets are angled (spread like a fan) with only one center fret perpendicular to the neck’s centerline.