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<!DOCTYPE html>
<html>
<head>
  <style>#point::after{content:"\213E"}</style>
</head>
<body>
  <h1>Double Struck Capital Gamma (ℾ) in HTML</h1>
  <p>Using Hex Code: &#x213E;</p>
  <p>Using HTML Code: &#8510;</p>
  <p>Regular capital Gamma: &Gamma; (&#x0393;)</p>
  <p id=point>Using CSS Entity: </p>
  <p>No named entity for U+213E</p>
</body>
</html>

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HTML Entity for Double Struck Capital Gamma (ℾ)