Code point
U+3354
Glyph appearance depends on your fonts.
U+3354
So<square> 30EB 30FC 30D6 30EBU+3354 SQUARE RUUBURU 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+3354
13140
㍔
㍔
E3 8D 94
3354
00003354
%E3%8D%94
\u3354
\u3354
\u3354
\3354