HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>Increment (∆) in HTML</title>
  <style>
    #point::after {
      content: "\2206";
    }
  </style>
</head>
<body>
  <p>Increment using Hex Code: &#x2206;</p>
  <p>Increment using HTML Code: &#8710;</p>
  <p id="point">Increment using CSS Entity: </p>
  <p>Typed directly: ∆</p>
</body>
</html>

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HTML Entity for Increment (∆)