noun, used as a prefix
Prefix used in music to indicate a sharp note, e.g., 嬰ヘ (F-sharp). Not used as a standalone noun.
嬰ヘ長調の曲を練習している。
I'm practicing a piece in F-sharp major.
この音は嬰ハだ。
This note is C-sharp.
変 is the prefix for 'flat' in music, the opposite of 嬰 (sharp).
The kanji 嬰 originally means 'infant' or 'to wear around the neck', but its use as 'sharp' in music is a specialized borrowing, likely from the idea of raising a note. The exact derivation is uncertain.