The Does Not Precede symbol (⊀). Copy and paste it, or use its Unicode, HTML, and CSS codes.
More from Math.
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+2280 (decimal 8832).
Use ⊀ in HTML to render ⊀ on a web page.
On Windows you can type it with Alt+8832 (hold Alt and enter the number on the numeric keypad).
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