Code point
U+3387
Glyph appearance depends on your fonts.
U+3387
So<square> 0047 0042U+3387 SQUARE GB 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+3387
13191
㎇
㎇
E3 8E 87
3387
00003387
%E3%8E%87
\u3387
\u3387
\u3387
\3387