The Long Left Right Arrow symbol (⟷). Copy and paste it, or use its Unicode, HTML, and CSS codes.
More from Arrows.
The quickest way is to copy ⟷ from this page and paste it anywhere. You can also insert it with its Unicode, HTML, or alt code listed above.
⟷ is U+27F7 (decimal 10231).
Use ⟷ in HTML to render ⟷ on a web page.
On Windows you can type it with Alt+10231 (hold Alt and enter the number on the numeric keypad).
Yes — copying is completely free and unlimited, and works right in your browser with no sign-up.