Code point
U+3394
Glyph appearance depends on your fonts.
U+3394
So<square> 0054 0048 007AU+3394 SQUARE THZ 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+3394
13204
㎔
㎔
E3 8E 94
3394
00003394
%E3%8E%94
\u3394
\u3394
\u3394
\3394