Code point
U+2756
Glyph appearance depends on your fonts.
U+2756
SoU+2756 BLACK DIAMOND MINUS WHITE X is a Unicode 16.0.0 character in the Other Symbol category. It belongs to the Dingbats block.
Choose the representation you need, then copy its value.
U+2756
10070
❖
❖
E2 9D 96
2756
00002756
%E2%9D%96
\u2756
\u2756
\u2756
\2756