Code point
U+2A28
Glyph appearance depends on your fonts.
U+2A28
SmU+2A28 PLUS SIGN WITH BLACK TRIANGLE is a Unicode 16.0.0 character in the Math Symbol category. It belongs to the Supplemental Mathematical Operators block.
Choose the representation you need, then copy its value.
U+2A28
10792
⨨
⨨
E2 A8 A8
2A28
00002A28
%E2%A8%A8
\u2A28
\u2A28
\u2A28
\2A28