Code point
U+3307
Glyph appearance depends on your fonts.
U+3307
So<square> 30A8 30B9 30AF 30FC 30C9U+3307 SQUARE ESUKUUDO 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+3307
13063
㌇
㌇
E3 8C 87
3307
00003307
%E3%8C%87
\u3307
\u3307
\u3307
\3307