The Anticlockwise Open Circle 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+21BA (decimal 8634).
Use ↺ in HTML to render ↺ on a web page.
On Windows you can type it with Alt+8634 (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.