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<!DOCTYPE html>
<html>
<head>
  <style>#point::after{content:"\221B"}</style>
</head>
<body>
  <h1>Cube Root (&#x221B;) in HTML</h1>
  <p>Using Hex Code: &#x221B;</p>
  <p>Using HTML Code: &#8731;</p>
  <p id=point>Using CSS Entity: </p>
  <p>Equation: &#x221B;27 = 3 &nbsp; Algebra: &#x221B;x</p>
  <p>Not Square Root &#x221A; (U+221A) or Fourth Root &#x221C;</p>
</body>
</html>

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HTML Entity for Cube Root (∛)