The Reversed Tilde symbol (∽). Copy and paste it, or use its Unicode, HTML, and CSS codes.
More from Math.
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+223D (decimal 8765).
Use ∽ in HTML to render ∽ on a web page.
On Windows you can type it with Alt+8765 (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.