From Longman Dictionary of Contemporary Englishtreble clefˌtreble ˈclef noun [countable] technical APMa sign ( ) at the beginning of a line of written music which shows that the note written on the bottom line of the stave is an E above middle C
Examples from the Corpus
treble clef• Its part is generally written in the treble clef on B or G to distinguish it from the side-drum.• Its part is written in the treble clef and sounds two octaves and a tone lower.• The treble clef is always used even for the bottom notes. 