Code point
U+220B
Glyph appearance depends on your fonts.
U+220B
SmU+220B CONTAINS AS MEMBER is a Unicode 16.0.0 character in the Math Symbol category. It belongs to the Mathematical Operators block.
Choose the representation you need, then copy its value.
U+220B
8715
∋
∋
∋
E2 88 8B
220B
0000220B
%E2%88%8B
\u220B
\u220B
\u220B
\220B