Code point
U+2120
Glyph appearance depends on your fonts.
U+2120
So<super> 0053 004DU+2120 SERVICE MARK is a Unicode 16.0.0 character in the Other Symbol category. It belongs to the Letterlike Symbols block.
Choose the representation you need, then copy its value.
U+2120
8480
℠
℠
E2 84 A0
2120
00002120
%E2%84%A0
\u2120
\u2120
\u2120
\2120