sharp sign
Music notation symbol (♯) that raises a note by a semitone. Compare with 変記号 (flat sign).
See also: 変記号
In this score, the F note has a sharp sign.
double sharp (symbol)
Compound of 嬰 (ei, 'sharp' in music) and 記号 (kigō, 'symbol'). The character 嬰 is used in this specialized sense in music terminology.