Code point
U+2B18
Glyph appearance depends on your fonts.
U+2B18
SoU+2B18 DIAMOND WITH TOP 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+2B18
11032
⬘
⬘
E2 AC 98
2B18
00002B18
%E2%AC%98
\u2B18
\u2B18
\u2B18
\2B18