Code point
U+3331
Glyph appearance depends on your fonts.
U+3331
So<square> 30D3 30EBU+3331 SQUARE BIRU is a Unicode 16.0.0 character in the Other Symbol category. It belongs to the CJK Compatibility block.
Choose the representation you need, then copy its value.
U+3331
13105
㌱
㌱
E3 8C B1
3331
00003331
%E3%8C%B1
\u3331
\u3331
\u3331
\3331