noun
The musical symbol placed at the beginning of a staff to indicate the pitch of the notes; used for higher-pitched instruments and voices.
ピアノの右手のパートはト音記号で書かれている。
The right-hand part for piano is written in the treble clef.
From ト (the musical note G) + 音 (sound) + 記号 (symbol). The clef's curl centers on the second line of the staff, indicating the note G.