U+00AC · Math symbol
HTML entity
¬
LaTeX
\neg
Not Sign Symbol ¬
¬ is not sign, U+00AC — \neg in LaTeX. It was added in Unicode 1.1, and Unicode files it under Math symbol.
Also known as
- angled dash (in typography)
Codes & technical data
| Unicode | U+00AC | |
|---|---|---|
| HTML hex | ¬ | |
| HTML decimal | ¬ | |
| CSS | \00AC | |
| JavaScript | \u{00AC} | |
| Python | \U000000AC | |
| Java / C# | \u00AC | |
| Rust | \u{00ac} | |
| Swift | \u{00AC} | |
| PHP | \u{00AC} | |
| URL encoded | %C2%AC | |
| UTF-8 bytes | C2 AC | |
| UTF-16 bytes | 00AC | |
| Base64 | wqw= | |
| Decimal | 172 | |
| HTML entity | ¬ | |
| LaTeX | \neg | |
| 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. ¬ exists in Latin-1 and Windows-1252, so even software that predates Unicode can store it.
- Size. 2 bytes in UTF-8. Character-limited fields — SMS, bios, some form validators — usually count bytes, not characters.
Unicode cross-references
The standard points readers of ¬ at these characters — usually because they look alike, or because one is the correct choice where the other is often used by mistake.
Other not characters
Unicode names 5 characters ending in “not”. They differ by direction, weight or decoration rather than by meaning.
Nearby in Latin-1 Supplement
The upper half of ISO 8859-1: the accented letters and the symbols that Western European printing needed but ASCII had no room for. This is where ° ± × ÷ £ ¥ © ® ½ ¼ live, which makes it the most-copied symbol block in Unicode despite being one of the oldest.
How to type ¬
| Windows | Type 00AC then press Alt+X, or hold Alt and type 172 on the numeric keypad |
|---|---|
| macOS | Press Ctrl+Cmd+Space, then search for “not sign” |
| Linux | Press Ctrl+Shift+U, type 00ac, 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 sign symbol?
- On Windows, type 00AC and press Alt+X. You can also hold Alt and type 172 on the numeric keypad. On Linux press Ctrl+Shift+U then 00ac. On any system the quickest route is the copy button on this page.
- What is the code for ¬?
- Not Sign is U+00AC, written in HTML as ¬ and in LaTeX as \neg. In UTF-8 it takes 2 bytes. The table above lists every escape format.
- What kind of character is ¬?
- Not Sign is filed under Math symbol in the Latin-1 Supplement 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.