U+29B1 · Math symbol
HTML entity
⦱
LaTeX
\emptysetobar
Empty Set With Overbar Symbol ⦱
⦱ is empty set with overbar. Write it in HTML as ⦱ or paste the character directly. It was added in Unicode 3.2, and Unicode files it under Math symbol.
Codes & technical data
| Unicode | U+29B1 | |
|---|---|---|
| HTML hex | ⦱ | |
| HTML decimal | ⦱ | |
| CSS | \29B1 | |
| JavaScript | \u{29B1} | |
| Python | \U000029B1 | |
| Java / C# | \u29B1 | |
| Rust | \u{29b1} | |
| Swift | \u{29B1} | |
| PHP | \u{29B1} | |
| URL encoded | %E2%A6%B1 | |
| UTF-8 bytes | E2 A6 B1 | |
| UTF-16 bytes | 29B1 | |
| Base64 | 4qax | |
| Decimal | 10673 | |
| HTML entity | ⦱ | |
| LaTeX | \emptysetobar | |
| Category | Math symbol (Sm) | |
| Introduced | Unicode 3.2 | |
Will ⦱ survive being pasted?
- Normalisation. Yes. ⦱ is unchanged by NFKC, so it survives normalising systems intact.
- Legacy encodings. ⦱ is Unicode-only — it has no Latin-1 equivalent, so a system stuck on an 8-bit encoding cannot represent it.
- Size. 3 bytes in UTF-8. Character-limited fields — SMS, bios, some form validators — usually count bytes, not characters.
Other overbar characters
Unicode names 12 characters ending in “overbar”. They differ by direction, weight or decoration rather than by meaning.
Nearby in Miscellaneous Mathematical Symbols-B
Brackets, fences and operators for advanced notation — the ceiling and floor variants, angle brackets and the many circled and squared operators.
All 128 characters in Miscellaneous Mathematical Symbols-B →
How to type ⦱
| Windows | Type 29B1 then press Alt+X |
|---|---|
| macOS | Press Ctrl+Cmd+Space, then search for “empty set with overbar” |
| Linux | Press Ctrl+Shift+U, type 29b1, press Enter |
| HTML | ⦱ |
About Unicode’s Math symbol category
Unicode classifies this as a mathematical symbol, which means software that lays out formulas treats it as an operator or relation and gives it spacing accordingly, rather than setting it tight against its neighbours like a letter.
Frequently asked questions
- How do I type the ⦱ empty set with overbar symbol?
- On Windows, type 29B1 and press Alt+X. On Linux press Ctrl+Shift+U then 29b1. On any system the quickest route is the copy button on this page.
- What is the code for ⦱?
- Empty Set With Overbar is U+29B1, written in HTML as ⦱ and in LaTeX as \emptysetobar. In UTF-8 it takes 3 bytes. The table above lists every escape format.
- What kind of character is ⦱?
- Empty Set With Overbar is filed under Math symbol in the Miscellaneous Mathematical Symbols-B block, and was introduced in Unicode 3.2. Unicode classifies this as a mathematical symbol, which means software that lays out formulas treats it as an operator or relation and gives it spacing accordingly, rather than setting it tight against its neighbours like a letter.