Code point
U+25FB
Glyph appearance depends on your fonts.
U+25FB
SmU+25FB WHITE MEDIUM SQUARE 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+25FB
9723
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E2 97 BB
25FB
000025FB
%E2%97%BB
\u25FB
\u25FB
\u25FB
\25FB