1570s in a musical sense, "character on a staff to indicate its name and pitch," from Middle French clef (12c.) "key, musical clef, trigger," from a figurative or transferred use of classical Latin clavis, which had only the literally sense "key" (see slot (n.2)). In the Middle Ages, the Latin word was used in the Guidonian system for "the lowest note of a scale," which is its basis (see keynote). The most common is the treble, violin, or G-clef, which crosses on the second line of the staff, denoting that as the G above middle C on the piano.
例文
1. In management，as in music，there is a base clef as well as a treble.
管理は楽曲のように低音と高音がある。
2.Please name the notes below according to the clef .
記号に基づいて次の各音符の音名を書いてください。
3.I love Clef -I don 't discont what he 's done for Haiti.
ハイチのためにしたことは無視されないワイクリフが好きだ。
4.Talking about that dragon treble clef pendant，It 'seems that you especially have luck with dragons！