Code point
U+3299
Glyph appearance depends on your fonts.
U+3299
So<circle> 79D8U+3299 CIRCLED IDEOGRAPH SECRET is a Unicode 16.0.0 character in the Other Symbol category. It belongs to the Enclosed CJK Letters and Months block.
Choose the representation you need, then copy its value.
U+3299
12953
㊙
㊙
E3 8A 99
3299
00003299
%E3%8A%99
\u3299
\u3299
\u3299
\3299