The Box Drawings Heavy 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+2501 (decimal 9473).
Use ━ in HTML to render ━ on a web page.
On Windows you can type it with Alt+9473 (hold Alt and enter the number on the numeric keypad).
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