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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>Fourth Root (U+221C) in HTML</title>
  <style>
    #point::after {
      content: "\221C";
    }
  </style>
</head>
<body>
  <p>Built with Hex: &#x221C;</p>
  <p>Built with Decimal: &#8732;</p>
  <p id="point">Built with CSS: </p>
  <p>Typed: &#x221C;</p>
  <p>Equation: &#x221C;16 = 2</p>
  <p>Compare: &#x221C; vs &radic; vs &#x221B;</p>
</body>
</html>

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HTML Entity for Fourth Root (∜)