U+21F9 · Math symbol
LaTeX
\nvleftrightarrow
Left Right Arrow With Vertical Stroke Symbol ⇹
⇹ is left right arrow with vertical stroke, U+21F9 — \nvleftrightarrow in LaTeX. It was added in Unicode 3.2, and Unicode files it under Math symbol.
Also known as
- z notation partial relation
Codes & technical data
| Unicode | U+21F9 | |
|---|---|---|
| HTML hex | ⇹ | |
| HTML decimal | ⇹ | |
| CSS | \21F9 | |
| JavaScript | \u{21F9} | |
| Python | \U000021F9 | |
| Java / C# | \u21F9 | |
| Rust | \u{21f9} | |
| Swift | \u{21F9} | |
| PHP | \u{21F9} | |
| URL encoded | %E2%87%B9 | |
| UTF-8 bytes | E2 87 B9 | |
| UTF-16 bytes | 21F9 | |
| Base64 | 4oe5 | |
| Decimal | 8697 | |
| LaTeX | \nvleftrightarrow | |
| 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.
Other stroke characters
Unicode names 24 characters ending in “stroke”. 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 21F9 then press Alt+X |
|---|---|
| macOS | Press Ctrl+Cmd+Space, then search for “left right arrow with vertical stroke” |
| Linux | Press Ctrl+Shift+U, type 21f9, 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 ⇹ left right arrow with vertical stroke symbol?
- On Windows, type 21F9 and press Alt+X. On Linux press Ctrl+Shift+U then 21f9. On any system the quickest route is the copy button on this page.
- What is the code for ⇹?
- Left Right Arrow With Vertical Stroke is U+21F9 and in LaTeX as \nvleftrightarrow. In UTF-8 it takes 3 bytes. The table above lists every escape format.
- What kind of character is ⇹?
- Left Right Arrow With Vertical Stroke is filed under Math symbol in the Arrows 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.