The term 'staff symbol, in music' can be answered with the word 'CLEF'. A CLEF is a musical symbol used to indicate the pitch of written notes. It is placed at the beginning of a staff, which is a set of five horizontal lines and four spaces that represent different pitches when notes are written on them. The most common clefs are the treble CLEF, bass CLEF, and alto CLEF. Each CLEF assigns a different note to the line or space it is written on.