Long Left Right Double Arrow (⟺) is the Supplemental Arrows-A character at Unicode U+27FA (LONG LEFT RIGHT DOUBLE ARROW). It is a long bidirectional double-shaft arrow often used for logical equivalence (iff).
Remember
Character ⟺
Unicode U+27FA
Hex entity ⟺
Decimal ⟺
Named entity ⟺ · ⟺ · ⟺
CSS escape \27FA
Not the same ⟷ (⟷) · ⇔ (⇔)
Named, hex, decimal, CSS, and a typed character all produce the same glyph: ⟺. Prefer ⟺ in HTML source for clarity. Case is significant: ⟺ ≠ ⟷.
Using Hex Code: ⟺
Using HTML Code: ⟺
Using Named Entity: ⟺
Using CSS Entity: ⟺
A ⟺ B
How It Works
1. Named:⟺ (aliases ⟺, ⟺) is the clearest HTML form and renders ⟺.
2. Hex:U+27FA → ⟺ in HTML. Same result as the named entity.
3. Decimal: same code point as 10234 → ⟺. Same result as hex.
4. CSS: use \27FA in content (not an HTML entity). #point::after appends that ⟺ after the paragraph text.
Pitfalls & Tips
Common mistakes when working with Long Left Right Double Arrow.
Case
⟺ ≠ ⟷
Capital A selects the double arrow (U+27FA). Lowercase ⟷ is the single long left-right arrow (U+27F7).
Length
⟺ ≠ ⇔
The short left-right double arrow is ⇔ (U+21D4). Use U+27FA only when you need the long form.
Aliases
Three named forms
⟺, ⟺, and ⟺ all map to U+27FA. Prefer one style consistently.
CSS vs HTML
Do not mix escapes
\27FA belongs in CSS. ⟺ / ⟺ / ⟺ belong in HTML.
A11y
Add nearby words
Pair the glyph with labels (for example A ⟺ B / “iff”) or use aria-label when it stands alone.
Semicolon
End references
Always finish with ; — write ⟺, not &xhArr.
Compatibility
Browser Support
Long Left Right Double Arrow (U+27FA) and its entity forms (⟺, ⟺, ⟺, ⟺, ⟺, CSS \\27FA) are supported in all modern browsers.
✓ Universal encoding
Long Left Right Double Arrow (⟺)
Encode with named, hex, decimal, or CSS escape — or type ⟺ directly in UTF-8 HTML.
100%Browser coverage
Google ChromeSupported
Yes
Microsoft EdgeSupported
Yes
Mozilla FirefoxSupported
Yes
Apple SafariSupported
Yes
OperaSupported
Yes
Internet ExplorerIE 9+
Yes*
U+27FAFull support
Bottom line: Prefer ⟺ for readable HTML. Use \\27FA only inside CSS content.
Remember
Key Takeaways
Unicode: this symbol is U+27FA (decimal 10234).
HTML: prefer ⟺ — or use ⟺ / ⟺.
Use ⟺, ⟺, or ⟺ (named), ⟺ (hex), ⟺ (decimal), or the CSS escape \27FA in the content property. All render ⟺.
U+27FA (LONG LEFT RIGHT DOUBLE ARROW). Hex 27FA, decimal 10234. It belongs to Supplemental Arrows-A (U+27F0–U+27FF).
Yes. ⟺, ⟺, and ⟺ are named HTML5 entities for ⟺ and are supported in all modern browsers.
Use it for logical equivalence (iff), bidirectional implication, and diagrams that need a long left-right double arrow. Prefer ⟺ for readable source.
HTML entities (⟺, ⟺, or ⟺) go in markup. The CSS escape \27FA is used in stylesheets (usually in the content property of ::before/::after). Both render ⟺.
No. ⟷ is the long single left-right arrow (U+27F7). ⇔ is the short left-right double arrow (U+21D4, ⇔). ⟺ (U+27FA) is the long left-right double arrow.
🤔
Did you know?
Long Left Right Double Arrow is Unicode U+27FA (decimal 10234) — LONG LEFT RIGHT DOUBLE ARROW in Supplemental Arrows-A. HTML5 provides ⟺, ⟺, and ⟺ — all render ⟺. Prefer ⟺ for readable source. Case matters: ⟷ is the single long form (⟷), ⟺ is the double (⟺).
