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<!DOCTYPE html>
<html>
<head>
  <style>#point::after{content:"\0192"}</style>
</head>
<body>
  <h1>Function Symbol (ƒ) in HTML</h1>
  <p>Using Hex Code: &#x192;</p>
  <p>Using HTML Code: &#402;</p>
  <p>Using Named Entity: &fnof;</p>
  <p id=point>Using CSS Entity: </p>
  <p>Notation: &fnof;(x) = x<sup>2</sup> + 1</p>
</body>
</html>

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HTML Entity for Function (ƒ)