Code point
U+228E
Glyph appearance depends on your fonts.
U+228E
SmU+228E MULTISET UNION 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+228E
8846
⊎
⊎
⊎
E2 8A 8E
228E
0000228E
%E2%8A%8E
\u228E
\u228E
\u228E
\228E