The Violist's Clef is a musical notation symbol used by string instruments, such as the viola, to indicate the pitch of notes. It is also known as the C Clef because it wraps around the note C on the staff. The Violist's Clef is also referred to as the ALTO clef, which is a four-letter word that can be used to solve a crossword puzzle. The Violist's Clef is used to indicate the range of notes that the viola can play, which is usually one octave lower than the treble clef.