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HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>Quadruple Prime (⁗) in HTML</title>
  <style>
    #point::after {
      content: "\2057";
    }
  </style>
</head>
<body>
  <p>Using Named Entity: f&qprime;(x)</p>
  <p>Using Hex Code: f&#x2057;(x)</p>
  <p>Using Decimal: f&#8279;(x)</p>
  <p>Using Direct Character: f⁗(x)</p>
  <p>Using CSS Entity: f<span id="point"></span>(x)</p>
</body>
</html>

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HTML Entity for Quadruple Prime (⁗)