The Box Drawings Double Vertical and Horizontal symbol (╬). Copy and paste it, or use its Unicode, HTML, and CSS codes.
More from Box Drawing.
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+256C (decimal 9580).
Use ╬ in HTML to render ╬ on a web page.
On Windows you can type it with Alt+9580 (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.