The Bottom Square Bracket Over Top Square Bracket 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+23B6 (decimal 9142).
Use ⎶ in HTML to render ⎶ on a web page.
On Windows you can type it with Alt+9142 (hold Alt and enter the number on the numeric keypad).
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