Code point
U+3343
Glyph appearance depends on your fonts.
U+3343
So<square> 30DE 30A4 30AF 30EDU+3343 SQUARE MAIKURO 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+3343
13123
㍃
㍃
E3 8D 83
3343
00003343
%E3%8D%83
\u3343
\u3343
\u3343
\3343