音符
1
musical note;note symbol
彼は、ピアノを音符を見ずに弾いた。
He played piano by ear.
2
phonetic symbol (incl. the kanji and kana-doubling symbols, vowel-lengthening symbol, etc.)
3
part of a kanji for which the role is primarily to represent the pronunciation (as opposed to the meaning)
See also:
意符 (いふ)