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<!DOCTYPE html>
<html>
<head>
  <style>#point::after{content:"\2124"}</style>
</head>
<body>
  <h1>Uppercase Z Double Struck Capital (ℤ)</h1>
  <p>Using Hex Code: &#x2124;</p>
  <p>Using Decimal: &#8484;</p>
  <p>Using Named Entity: &Zopf;</p>
  <p id=point>Using CSS Entity: </p>
  <p style="font-family:Cambria Math,serif">n ∈ ℤ</p>
</body>
</html>

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HTML Entity for Uppercase Z Double Struck Capital (ℤ)