Code point
U+3356
Glyph appearance depends on your fonts.
U+3356
So<square> 30EC 30F3 30C8 30B2 30F3U+3356 SQUARE RENTOGEN 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+3356
13142
㍖
㍖
E3 8D 96
3356
00003356
%E3%8D%96
\u3356
\u3356
\u3356
\3356