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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>Function (U+0192) in HTML</title>
  <style>
    #point::after {
      content: "\0192";
    }
  </style>
</head>
<body>
  <p>Built with Named: &fnof;</p>
  <p>Built with Hex: &#x192;</p>
  <p>Built with Decimal: &#402;</p>
  <p id="point">Built with CSS: </p>
  <p>Typed: &#x0192;</p>
  <p>Notation: <span aria-label="f of x equals x squared plus 1">&fnof;(x) = x&sup2; + 1</span></p>
</body>
</html>

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HTML Entity for Function (ƒ)