Code point
U+29B1
Glyph appearance depends on your fonts.
U+29B1
SmU+29B1 EMPTY SET WITH OVERBAR 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+29B1
10673
⦱
⦱
⦱
E2 A6 B1
29B1
000029B1
%E2%A6%B1
\u29B1
\u29B1
\u29B1
\29B1