The term 'PITCH SYMBOL' can be solved by the four-letter 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 to indicate which notes should be played higher or lower. There are three main types of clefs: treble, bass, and alto. The treble CLEF is used for higher pitched instruments such as the violin, while the bass CLEF is used for lower pitched instruments such as the cello. The alto CLEF is used for middle-range instruments such as the viola.