⟷

Long Left Right Arrow

Unicode
U+27F7
Category
Arrows
HTML Entity
⟷
CSS
\27F7
The Long Left Right Arrow (⟷) features a horizontal line with arrowheads pointing in opposite directions, distinguished by its elongated shaft compared to standard double-ended arrows. In mathematics and formal logic, it frequently represents a logical equivalence or an "if and only if" relationship between two statements. Typographers and designers also use it to visually indicate a reciprocal relationship, a bidirectional mapping, or a physical distance between two objects.

How to Type

Windows
Type 27F7 then Alt+X in Word, or Win+. and search 'arrow'
macOS
Control+Command+Space then search 'long left right arrow'
Linux
Ctrl+Shift+U then type 27f7
HTML
⟷ or ⟷

In Programming

In LaTeX and MathML, programmers use commands like \longleftrightarrow to render this symbol in mathematical formulas, typically to denote a bidirectional mapping function, a state transition, or a strict logical equivalence.

Read full meaning article

Tags

Unicode 27F7 arrow biconditional bidirectional mapping direction double headed long arrow equivalence arrow if and only if iff left right logical equivalence long long double arrow math

Related Symbols

← Left Arrow ↑ Up Arrow → Right Arrow ↓ Down Arrow ↔ Left Right Arrow ↕ Up Down Arrow ↖ North West Arrow ↗ North East Arrow ↘ South East Arrow ↙ South West Arrow ↞ Left Two Headed Arrow ↠ Right Two Headed Arrow