G clef' The term G, IN THE C SCALE is represented by the three letter solution 'G clef'. The G clef is a musical symbol used to indicate the pitch of middle G on the musical staff. It is also known as a treble clef, as it is most commonly used to notate higher pitched instruments such as the violin, flute, and trumpet. The G clef is one of the most recognizable symbols in music and is often used to decorate music-related items such as t-shirts and mugs.