The term 'treble, for flute music' can be represented by the four-letter word 'CLEF'. A CLEF is a symbol used in musical notation to indicate the pitch of written notes. In particular, the treble CLEF is used for higher-pitched instruments such as the flute. It is also known as the G CLEF, as it wraps around the G line on the staff. The treble CLEF is one of the most commonly used clefs in modern music notation.