Empty Set With Overbar Symbol
⦱ (U+29B1) is the empty set symbol shown with an overbar.
U+29B1
⦱ is a mathematical symbol labeled “empty set with overbar” in Unicode. It’s useful when you need to typeset a variant of the empty set in text or UI. This page helps you copy it and use it consistently in documents and code.
Empty Set With Overbar Symbol Meaning
The symbol ⦱ is known in Unicode as “EMPTY SET WITH OVERBAR” (U+29B1). In mathematical typography, it represents an empty set variant—typically used in contexts where authors want to distinguish a special form of “nothing” or an empty collection from the plain empty set symbol. Because notation varies between fields and authors, the most reliable way to interpret it is by looking at the surrounding expression or document style. When you’re writing or designing materials, include it exactly as shown, and consider matching the font and rendering system so the overbar is clearly visible.
Common uses
- •Labeling a result that represents “no elements” in math-focused documents
- •Indicating a special case or variant of the empty set in proofs and notation
- •Using it in educational materials to differentiate empty-set forms
- •Marking empty collections in technical UI text (e.g., filtered-out items)
- •Creating consistent math notation in web and code-rendered content
Examples
⦱ Empty Set with Overbar
- ⦱Let S = ⦱.
- ⦱If A ∩ B is ⦱, then there are no common elements.
- ⦱The set of solutions is ⦱ under these constraints.
- ⦱Consider the family F where F = ⦱.
- ⦱For k beyond the range, the selection set becomes ⦱.
Variations
Ready to copy
Technical codes
| Unicode | U+29B1 | |
| HTML Entity | ⦱ | |
| HTML Code | ⦱ | |
| CSS | \29B1 |
FAQ
What Unicode character is ⦱?
⦱ is the Unicode character U+29B1, named “EMPTY SET WITH OVERBAR”.
How do I copy ⦱?
Copy the character directly from this page (⦱). For reliable web rendering, paste it into your editor or app that supports Unicode.
What does the overbar indicate?
The overbar marks a specific variant of the empty set notation. Exact meaning can depend on the author’s convention, so check how it’s used in your surrounding expression.
How can I insert it in code?
Use the provided escapes: HTML entity is ⦱, CSS escape is \\29B1, and JavaScript escape is \\u{29B1}.