Code point
U+309C
Glyph appearance depends on your fonts.
U+309C
Sk<compat> 0020 309AU+309C KATAKANA-HIRAGANA SEMI-VOICED SOUND MARK is a Unicode 16.0.0 character in the Modifier Symbol category. It belongs to the Hiragana block.
Choose the representation you need, then copy its value.
U+309C
12444
゜
゜
E3 82 9C
309C
0000309C
%E3%82%9C
\u309C
\u309C
\u309C
\309C