Code point
U+3303
Glyph appearance depends on your fonts.
U+3303
So<square> 30A2 30FC 30EBU+3303 SQUARE AARU 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+3303
13059
㌃
㌃
E3 8C 83
3303
00003303
%E3%8C%83
\u3303
\u3303
\u3303
\3303