Code point
U+25F8
Glyph appearance depends on your fonts.
U+25F8
SmU+25F8 UPPER LEFT 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+25F8
9720
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E2 97 B8
25F8
000025F8
%E2%97%B8
\u25F8
\u25F8
\u25F8
\25F8