Code point
U+25D1
Glyph appearance depends on your fonts.
U+25D1
SoU+25D1 CIRCLE WITH RIGHT 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+25D1
9681
◑
◑
E2 97 91
25D1
000025D1
%E2%97%91
\u25D1
\u25D1
\u25D1
\25D1