About COMBINING KATAKANA-HIRAGANA VOICED SOUND MARK
Combining Katakana-hiragana Voiced Sound Mark (U+0C1B) is a Unicode nonspacing mark from the Hiragana block. It resides on Plane 0 (BMP, Basic Multilingual Plane), has bidirectional class NSM (nonspacing mark), is not mirrored, and has combining class 8 (Kana Voicing). In HTML it can be written as ゙ or ゙.