What is "dakuten"

n. a Japanese voicing mark (゛)

, colloquially , is a diacritic sign most often used in the Japanese kana syllabaries to indicate that the consonant of a syllable should be pronounced voiced, for instance, on sounds that have undergone rendaku (sequential voicing).

Handakuten , colloquially , is a diacritic used with the kana for syllables starting with h to indicate that they should instead be pronounced with .