U+29B1 "⦱" Empty Set with Overbar Unicode Character
Unicode Version 17.0
⦱
U+29B1 "⦱" Empty Set with Overbar is a mathematical notation symbol that combines the standard empty set symbol (∅) with a horizontal line or overbar drawn above it. This variant is often used in abstract algebra and set theory to denote a specifically marked version of the empty set, such as a formal distinction in certain axiomatic systems or to represent the complement of a universal set in contexts where a single symbol is needed. Its inclusion in Unicode supports precise typesetting in academic documents and digital communication where this specialized notation is required.
General Properties
| Code Point | U+29B1 |
| Version Added | 3.2 |
| Name | Empty Set with Overbar |
| Block | Miscellaneous Mathematical Symbols-B |
| General Category | Math Symbol |
| Canonical Combining Class | Not Reordered |
| Bidirectional Class | Other Neutral |
Encodings
| HTML Decimal Encoding | ⦱ |
| HTML Hex Encoding | ⦱ |
| UTF-8 Encoding | 0xE2 0xA6 0xB1 |
| UTF-16 Encoding | 0x29B1 |
| UTF-32 Encoding | 0x000029B1 |
| C/C++/Java Escape | \u29b1 |
Unicode Properties
| NFC Quick Check | Yes |
| NFD Quick Check | Yes |
| NFKC Quick Check | Yes |
| NFKD Quick Check | Yes |
| Numeric Type | None |
| Numeric Value | NaN |
| Line Break | Alphabetic |
| Script | Common |
| Script Extensions | Common |
| Indic Syllabic Category | Other |
| Pattern Syntax | Yes |
| Math | Yes |
| Vertical Orientation | Rotated |
| Grapheme Base | Yes |
| Grapheme Cluster Break | Other |
| Word Break | Other |
| Sentence Break | Other |