Code point
U+25A8
Glyph appearance depends on your fonts.
U+25A8
SoU+25A8 SQUARE WITH UPPER RIGHT TO LOWER LEFT FILL is a Unicode 16.0.0 character in the Other Symbol category. It belongs to the Geometric Shapes block.
Choose the representation you need, then copy its value.
U+25A8
9640
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▨
E2 96 A8
25A8
000025A8
%E2%96%A8
\u25A8
\u25A8
\u25A8
\25A8