Code point
U+25E7
Glyph appearance depends on your fonts.
U+25E7
SoU+25E7 SQUARE WITH LEFT HALF BLACK 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+25E7
9703
◧
◧
E2 97 A7
25E7
000025E7
%E2%97%A7
\u25E7
\u25E7
\u25E7
\25E7