Code point
U+FFED
Glyph appearance depends on your fonts.
U+FFED
So<narrow> 25A0U+FFED HALFWIDTH BLACK SQUARE is a Unicode 16.0.0 character in the Other Symbol category. It belongs to the Halfwidth and Fullwidth Forms block.
Choose the representation you need, then copy its value.
U+FFED
65517
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EF BF AD
FFED
0000FFED
%EF%BF%AD
\uFFED
\uFFED
\uFFED
\FFED