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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>Double Prime (″) in HTML</title>
  <style>
    #point::after {
      content: "\2033";
    }
  </style>
</head>
<body>
  <p>Double Prime using Named Entity: &Prime;</p>
  <p>Double Prime using Hex Code: &#x2033;</p>
  <p>Double Prime using HTML Code: &#8243;</p>
  <p id="point">Double Prime using CSS Entity: </p>
  <p>Typed directly: ″</p>
  <p>Height: 5&prime; 10&Prime;</p>
  <p>Second derivative: f&Prime;(x)</p>
</body>
</html>

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HTML Entity for Double Prime (″)