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Empty Set HTML entity ∅
∅ is the HTML entity for Empty Set ∅ (U+2205). Copy the decimal ∅ and hex ∅ codes plus CSS, JavaScript, Python and URL escapes.
- Entity
∅- Also written
∅∅∅- Code point
- U+2205
- Unicode name
- EMPTY SET
- Block
- Mathematical Operators
- Category
- Math symbol (Sm)
- Since
- Unicode 1.1
- Defined in
- HTML 4.01 and HTML5
Codes to copy
| HTML named | ∅Works in HTML; in XML only & < > " ' are predefined. | |
|---|---|---|
| HTML decimal | ∅Works in HTML and XML. | |
| HTML hex | ∅Works in HTML and XML. | |
| CSS | content: "\2205";In a stylesheet, for ::before and ::after. | |
| JavaScript | "\u2205"Also valid in JSON. | |
| Python | "\u2205"Python 3 string literal. | |
| Python by name | "\N{EMPTY SET}"Readable alternative using the Unicode name. | |
| URL | %E2%88%85Percent-encoded UTF-8 bytes, for a path or query value. | |
| UTF-8 bytes | E2 88 853 bytes. | |
| UTF-16 | 22051 code unit, which is what JavaScript length counts. |
When to use it
The empty set sign. It is often confused with the Scandinavian letter ø and with the diameter sign U+2300, which are different characters.
The name dates from HTML 4, so it works in every browser and in old email clients.
More maths operators
∈Element Of∃There Exists∉Not An Element of∂Partial Differential∋Contains As Member∁Complement∌Does Not Contain As Member∀For All
All maths operators · Every HTML entity · Encode or decode text
Source: the WHATWG HTML Standard list of named character references and the Unicode Character Database (Unicode 18.0).