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HTML Entity Detail
HTML Entity - Left Right Double Arrow
Left Right Double Arrow is a arrow symbols for direction, navigation, and flow. This HTML entity enables web developers to display this character reliably across all browsers without encoding issues.
Symbol preview
⇔
Unicode
U+21D4
HTML entity
⇔
CSS code
\21D4
Usage Examples
Use this HTML entity in user interfaces, diagrams, and documentation to indicate direction, movement, or relationships between elements.
Related Entities
Common Mistakes
⚠️
Mistake: Using hyphens and greater-than signs (->) instead of proper arrow symbols
Fix: Use → (→) for right arrow in mathematical mappings. The ASCII -> looks unprofessional and does not render consistently for mathematical notation.
⚠️
Mistake: Confusing single arrows with double arrows in logic notation
Fix: Use → (→) for function mappings and chemical reactions. Use ⇒ (⇒) for logical implication (P ⇒ Q). They have distinctly different meanings in mathematics.
Left Right Double Arrow
Select any code to highlight it before copying.
Category: Arrows
| Unicode | U+21D4 |
|---|---|
| Hex Code | ⇓ |
| HTML Code | ⇔ |
| HTML Entity | ⇔ |
| CSS Code | \21D4 |
| Windows Shortcut | |
| Mac Shortcut | |
HTML code example
CSS code example
Last updated: 21 Jun 2026
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