Code point
U+25F0
Glyph appearance depends on your fonts.
U+25F0
SoU+25F0 WHITE SQUARE WITH UPPER LEFT QUADRANT 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+25F0
9712
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E2 97 B0
25F0
000025F0
%E2%97%B0
\u25F0
\u25F0
\u25F0
\25F0