Code point
U+29EE
Glyph appearance depends on your fonts.
U+29EE
SmU+29EE ERROR-BARRED WHITE SQUARE is a Unicode 16.0.0 character in the Math Symbol category. It belongs to the Miscellaneous Mathematical Symbols-B block.
Choose the representation you need, then copy its value.
U+29EE
10734
⧮
⧮
E2 A7 AE
29EE
000029EE
%E2%A7%AE
\u29EE
\u29EE
\u29EE
\29EE