Code point
U+3344
Glyph appearance depends on your fonts.
U+3344
So<square> 30DE 30A4 30EBU+3344 SQUARE MAIRU 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+3344
13124
㍄
㍄
E3 8D 84
3344
00003344
%E3%8D%84
\u3344
\u3344
\u3344
\3344