Code point
U+2B1D
Glyph appearance depends on your fonts.
U+2B1D
SoU+2B1D BLACK VERY SMALL SQUARE is a Unicode 16.0.0 character in the Other Symbol category. It belongs to the Miscellaneous Symbols and Arrows block.
Choose the representation you need, then copy its value.
U+2B1D
11037
⬝
⬝
E2 AC 9D
2B1D
00002B1D
%E2%AC%9D
\u2B1D
\u2B1D
\u2B1D
\2B1D