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<!DOCTYPE html>
<html>
<head>
  <style>#point::after{content:"\221C"}</style>
</head>
<body>
  <h1>Fourth Root (&#x221C;) in HTML</h1>
  <p>Using Hex Code: &#x221C;</p>
  <p>Using HTML Code: &#8732;</p>
  <p id=point>Using CSS Entity: </p>
  <p>Equation: &#x221C;16 = 2 &nbsp; Algebra: &#x221C;x</p>
  <p>Not Square Root &#x221A; (U+221A) or Cube Root &#x221B; (U+221B)</p>
</body>
</html>

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HTML Entity for Fourth Root (∜)