Code point
U+2B13
Glyph appearance depends on your fonts.
U+2B13
SoU+2B13 SQUARE WITH BOTTOM HALF BLACK 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+2B13
11027
⬓
⬓
E2 AC 93
2B13
00002B13
%E2%AC%93
\u2B13
\u2B13
\u2B13
\2B13