The Square with Diagonal Crosshatch Fill symbol (▩). Copy and paste it, or use its Unicode, HTML, and CSS codes.
More from Geometric Shapes.
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+25A9 (decimal 9641).
Use ▩ in HTML to render ▩ on a web page.
On Windows you can type it with Alt+9641 (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.