Code point
U+25FF
Glyph appearance depends on your fonts.
U+25FF
SmU+25FF LOWER RIGHT TRIANGLE is a Unicode 16.0.0 character in the Math Symbol category. It belongs to the Geometric Shapes block.
Choose the representation you need, then copy its value.
U+25FF
9727
◿
◿
E2 97 BF
25FF
000025FF
%E2%97%BF
\u25FF
\u25FF
\u25FF
\25FF