A four-pointed star.
More from Stars.
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+2726 (decimal 10022).
Use ✦ in HTML to render ✦ on a web page.
On Windows you can type it with Alt+10022 (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.