handakuten; semi-voiced sound mark
The diacritic mark ゜ used in kana to change an 'h' sound to a 'p' sound (e.g., は→ぱ). A basic term in Japanese phonology and writing.
"ぱ" is a character formed by adding a handakuten to "は".
半濁点は「゜」と書きます。
The handakuten is written as "゜".