Code point
U+25A3
Glyph appearance depends on your fonts.
U+25A3
SoU+25A3 WHITE SQUARE CONTAINING BLACK SMALL SQUARE 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+25A3
9635
▣
▣
E2 96 A3
25A3
000025A3
%E2%96%A3
\u25A3
\u25A3
\u25A3
\25A3