U+2901 · Math symbol
LaTeX
\nVtwoheadrightarrow
Rightwards Two-Headed Arrow With Double Vertical Stroke Symbol ⤁
⤁ is rightwards two-headed arrow with double vertical stroke, U+2901 — \nVtwoheadrightarrow in LaTeX. It was added in Unicode 3.2, and Unicode files it under Math symbol.
Also known as
- z notation finite surjection
Codes & technical data
| Unicode | U+2901 | |
|---|---|---|
| HTML hex | ⤁ | |
| HTML decimal | ⤁ | |
| CSS | \2901 | |
| JavaScript | \u{2901} | |
| Python | \U00002901 | |
| Java / C# | \u2901 | |
| Rust | \u{2901} | |
| Swift | \u{2901} | |
| PHP | \u{2901} | |
| URL encoded | %E2%A4%81 | |
| UTF-8 bytes | E2 A4 81 | |
| UTF-16 bytes | 2901 | |
| Base64 | 4qSB | |
| Decimal | 10497 | |
| LaTeX | \nVtwoheadrightarrow | |
| Category | Math symbol (Sm) | |
| Introduced | Unicode 3.2 | |
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.
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 stroke characters
Unicode names 24 characters ending in “stroke”. They differ by direction, weight or decoration rather than by meaning.
Nearby in Supplemental Arrows-B
The large second arrow block: harpoons, arrows with hooks and tails, and the paired forms that commutative diagrams need.
How to type ⤁
| Windows | Type 2901 then press Alt+X |
|---|---|
| macOS | Press Ctrl+Cmd+Space, then search for “rightwards two-headed arrow with double vertical stroke” |
| Linux | Press Ctrl+Shift+U, type 2901, 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 with double vertical stroke symbol?
- On Windows, type 2901 and press Alt+X. On Linux press Ctrl+Shift+U then 2901. On any system the quickest route is the copy button on this page.
- What is the code for ⤁?
- Rightwards Two-Headed Arrow With Double Vertical Stroke is U+2901 and in LaTeX as \nVtwoheadrightarrow. In UTF-8 it takes 3 bytes. The table above lists every escape format.
- What kind of character is ⤁?
- Rightwards Two-Headed Arrow With Double Vertical Stroke is filed under Math symbol in the Supplemental Arrows-B block, and was introduced in Unicode 3.2. 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.