Code point
U+3388
Glyph appearance depends on your fonts.
U+3388
So<square> 0063 0061 006CU+3388 SQUARE CAL 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+3388
13192
㎈
㎈
E3 8E 88
3388
00003388
%E3%8E%88
\u3388
\u3388
\u3388
\3388