noun
C clef
A musical clef that indicates the position of middle C on a staff. Used in music notation.
ハ音記号は、楽譜で中央ハの位置を示すために使われる。
The C clef is used in sheet music to indicate the position of middle C.
Compound of ハ (ha, the musical note C) + 音 (on, 'sound') + 記号 (kigō, 'symbol'). The note name ハ comes from the iroha ordering system.