Code point
U+25AC
Glyph appearance depends on your fonts.
U+25AC
SoU+25AC BLACK RECTANGLE 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+25AC
9644
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E2 96 AC
25AC
000025AC
%E2%96%AC
\u25AC
\u25AC
\u25AC
\25AC