Katakana-hiragana Semi-voiced Sound Mark (U+309C) is a Unicode modifier symbol from the Hiragana block. It resides on Plane 0 (BMP, Basic Multilingual Plane), has bidirectional class ON (other neutrals), is not mirrored, and has combining class 0 (Not Reordered). In HTML it can be written as ゜ or ゜.