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<!DOCTYPE html>
<html>
<head>
  <style>#point::after{content:"\2209"}</style>
</head>
<body>
  <h1>Not Element Of (∉) in HTML</h1>
  <p>Using Hex Code: &#x2209;</p>
  <p>Using Decimal: &#8713;</p>
  <p>Using Named Entity: &notin;</p>
  <p id=point>Using CSS Entity: </p>
  <p>Example: 5 ∉ {1, 2, 3, 4}</p>
</body>
</html>

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HTML Entity for Not Element Of (∉)