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HTML Code

<!DOCTYPE html>
<html>
<head>
  <style>#point::after{content:"\2201"}</style>
</head>
<body>
  <h1>Complement (&#x2201;) in HTML</h1>
  <p>Using Hex Code: &#x2201;</p>
  <p>Using HTML Code: &#8705;</p>
  <p>Using HTML Entity: &comp;</p>
  <p id=point>Using CSS Entity: </p>
  <p>Set theory: &comp;A (complement of set A)</p>
  <p>Not Commercial Minus &#x2052; (U+2052) or colon : (U+003A)</p>
</body>
</html>

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HTML Entity for Complement (∁)