半濁点

Etymology
ja

Noun

 * 1) a diacritical mark, such as  on, used to:
 * 2) derive the kana for a mora onsetted with /p/ from the kana for a mora onsetted with /h/
 * 3) orthographically phonetically denote [ŋ], a realization of /ɡ/ especially occurring word-medially, instead of the standard dakuten, chiefly in pronunciation dictionaries