Code point
U+3031
Glyph appearance depends on your fonts.
U+3031
LmU+3031 VERTICAL KANA REPEAT MARK is a Unicode 16.0.0 character in the Modifier Letter category. It belongs to the CJK Symbols and Punctuation block.
Choose the representation you need, then copy its value.
U+3031
12337
〱
〱
E3 80 B1
3031
00003031
%E3%80%B1
\u3031
\u3031
\u3031
\3031