U+2209 · Math symbol
HTML entity
∉
LaTeX
\notin
Not An Element Of Symbol ∉
∉ is not an element of, U+2209. Unicode records it as a compatibility form of ∉. It was added in Unicode 1.1, and Unicode files it under Math symbol.
Codes & technical data
| Unicode | U+2209 | |
|---|---|---|
| HTML hex | ∉ | |
| HTML decimal | ∉ | |
| CSS | \2209 | |
| JavaScript | \u{2209} | |
| Python | \U00002209 | |
| Java / C# | \u2209 | |
| Rust | \u{2209} | |
| Swift | \u{2209} | |
| PHP | \u{2209} | |
| URL encoded | %E2%88%89 | |
| UTF-8 bytes | E2 88 89 | |
| UTF-16 bytes | 2209 | |
| Base64 | 4oiJ | |
| Decimal | 8713 | |
| HTML entity | ∉ | |
| LaTeX | \notin | |
| Decomposes to | ∉ | |
| Category | Math symbol (Sm) | |
| Introduced | Unicode 1.1 | |
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.
Nearby in Mathematical Operators
The operators mathematics and programming share — set theory, logic, calculus, comparison. Almost every character here has a LaTeX command, which is usually the fastest way to name the one you mean.
How to type ∉
| Windows | Type 2209 then press Alt+X |
|---|---|
| macOS | Press Ctrl+Cmd+Space, then search for “not an element of” |
| Linux | Press Ctrl+Shift+U, type 2209, 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 ∉ not an element of symbol?
- On Windows, type 2209 and press Alt+X. On Linux press Ctrl+Shift+U then 2209. On any system the quickest route is the copy button on this page.
- What is the code for ∉?
- Not An Element Of is U+2209, written in HTML as ∉ and in LaTeX as \notin. In UTF-8 it takes 3 bytes. The table above lists every escape format.
- What kind of character is ∉?
- Not An Element Of is filed under Math symbol in the Mathematical Operators block, and was introduced in Unicode 1.1. 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.