The Box Drawings Heavy Vertical and Horizontal symbol (╋). Copy and paste it, or use its Unicode, HTML, and CSS codes.
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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+254B (decimal 9547).
Use ╋ in HTML to render ╋ on a web page.
On Windows you can type it with Alt+9547 (hold Alt and enter the number on the numeric keypad).
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