What ↚ means
It means “not leftwards” in mathematical notation. The stroke negates the leftward relation: it says that relation does not hold, rather than pointing left.
An entity described as “not left arrow” appears in ISO 8879, a document-markup standard published in 1986.
Mathematical and technical notation.
Don't confuse it with
1Questions people ask
1Why does ↚ show as a box on some devices?
Because that device's fonts have no glyph for it. The character is still correct and still copies correctly — the box is a missing glyph, not a broken character.
How to type ↚
Windows (Word)
Alt+XType 219A, then Alt+X to get ↚.
Windows
Win+Rrun charmap for the full table, or use the emoji picker's Ω symbols tab (Win + .).
macOS
Control+Command+SpaceOpen the character viewer and search “leftwards arrow with stroke”.
Linux
Ctrl+Shift+UType 219a, then Enter or Space.
HTML
↚CSS
\219ALaTeX
In math mode, use \nleftarrow with a math package that defines it.
HTML
Use ↚, ↚, or the numeric reference ↚.
Codes and encoding1 code points
HTML decimal
↚
HTML hex
↚
CSS content
content: "\219A";
Each escape is closed by the next backslash; a trailing space is needed before a literal hex digit.
URL encoded
%E2%86%9A
1
On screen
1
Code points
1
JS .length
3
UTF-8 bytes
A visible symbol can contain several code points. JS .length counts UTF-16 units; UTF-8 counts bytes.