Code point
U+2101
Glyph appearance depends on your fonts.
U+2101
So<compat> 0061 002F 0073U+2101 ADDRESSED TO THE SUBJECT 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+2101
8449
℁
℁
E2 84 81
2101
00002101
%E2%84%81
\u2101
\u2101
\u2101
\2101