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HTML Code

<!DOCTYPE html>
<html>
<head>
  <style>#point::after{content:"\22C4"}</style>
</head>
<body class=math>
  <h1>Diamond Operator (&#x22C4;) in HTML</h1>
  <p>Using Hex Code: &#x22C4;</p>
  <p>Using HTML Code: &#8900;</p>
  <p>Using Named Entity: &diamond;</p>
  <p>Logic: &diamond; p</p>
  <p id=point>Using CSS Entity: </p>
</body>
</html>

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HTML Entity for Diamond Operator (⋄)