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<!DOCTYPE html>
<html>
<head>
  <style>#point::after{content:"\221A"}</style>
</head>
<body>
  <h1>Square Root (√) in HTML</h1>
  <p>Named: &radic;9 = 3</p>
  <p>Hex: &#x221A;16 = 4</p>
  <p>Decimal: &#8730;25 = 5</p>
  <p id=point>CSS: 36 = 6</p>
</body>
</html>

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HTML Entity for Square Root (√)