Code point
U+2B1B
Glyph appearance depends on your fonts.
U+2B1B
SoU+2B1B BLACK LARGE 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+2B1B
11035
⬛
⬛
E2 AC 9B
2B1B
00002B1B
%E2%AC%9B
\u2B1B
\u2B1B
\u2B1B
\2B1B