U+21A0 · Math symbol
HTML entity
↠
LaTeX
\twoheadrightarrow
Rightwards Two Headed Arrow Symbol ↠
↠ is rightwards two headed arrow, U+21A0. Unicode also records it as “z notation total surjection”. It was added in Unicode 1.1, and Unicode files it under Math symbol.
Also known as
- z notation total surjection
- fast cursor right
Unicode 1.0 called this character right two headed arrow. The standard renamed it later, but documents, fonts and font-editing tools from that era still use the old name.
Codes & technical data
| Unicode | U+21A0 | |
|---|---|---|
| HTML hex | ↠ | |
| HTML decimal | ↠ | |
| CSS | \21A0 | |
| JavaScript | \u{21A0} | |
| Python | \U000021A0 | |
| Java / C# | \u21A0 | |
| Rust | \u{21a0} | |
| Swift | \u{21A0} | |
| PHP | \u{21A0} | |
| URL encoded | %E2%86%A0 | |
| UTF-8 bytes | E2 86 A0 | |
| UTF-16 bytes | 21A0 | |
| Base64 | 4oag | |
| Decimal | 8608 | |
| HTML entity | ↠ | |
| LaTeX | \twoheadrightarrow | |
| 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.
Other arrow characters
Unicode names 24 characters ending in “arrow”. They differ by direction, weight or decoration rather than by meaning.
Nearby in Arrows
The core arrow set: every direction, plus doubled, dashed, hooked and looped variants. Anything not here is in one of the four supplemental arrow blocks, which exist because this one filled up.
How to type ↠
| Windows | Type 21A0 then press Alt+X |
|---|---|
| macOS | Press Ctrl+Cmd+Space, then search for “rightwards two headed arrow” |
| Linux | Press Ctrl+Shift+U, type 21a0, 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 ↠ rightwards two headed arrow symbol?
- On Windows, type 21A0 and press Alt+X. On Linux press Ctrl+Shift+U then 21a0. On any system the quickest route is the copy button on this page.
- What is the code for ↠?
- Rightwards Two Headed Arrow is U+21A0, written in HTML as ↠ and in LaTeX as \twoheadrightarrow. In UTF-8 it takes 3 bytes. The table above lists every escape format.
- What kind of character is ↠?
- Rightwards Two Headed Arrow is filed under Math symbol in the Arrows 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.