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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>Double Integral (∬) in HTML</title>
  <style>
    #point::after {
      content: "\222C";
    }
  </style>
</head>
<body>
  <p>Double Integral using Named Entity: &Int;</p>
  <p>Double Integral using Hex Code: &#x222C;</p>
  <p>Double Integral using HTML Code: &#8748;</p>
  <p id="point">Double Integral using CSS Entity: </p>
  <p>Typed directly: ∬</p>
  <p>Calculus: &Int;<sub>D</sub> f(x,y) dA</p>
</body>
</html>

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HTML Entity for Double Integral (∬)