Code point
U+1F791
Glyph appearance depends on your fonts.
U+1F791
SoU+1F791 HEAVY WHITE SQUARE is a Unicode 16.0.0 character in the Other Symbol category. It belongs to the Geometric Shapes Extended block.
Choose the representation you need, then copy its value.
U+1F791
128913
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F0 9F 9E 91
D83D DF91
0001F791
%F0%9F%9E%91
\U0001F791
\u{1F791}
\uD83D\uDF91
\1F791