The Box Drawings Light Double Dash 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+254C (decimal 9548).
Use ╌ in HTML to render ╌ on a web page.
On Windows you can type it with Alt+9548 (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.