The Left Raised Omission Bracket symbol (⸌). Copy and paste it, or use its Unicode, HTML, and CSS codes.
More from Punctuation.
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+2E0C (decimal 11788).
Use ⸌ in HTML to render ⸌ on a web page.
On Windows you can type it with Alt+11788 (hold Alt and enter the number on the numeric keypad).
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