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<!DOCTYPE html>
<html>
<head>
  <style>#point::after{content:"\2205"}</style>
</head>
<body>
  <h1>Empty Set (∅)</h1>
  <p>Using Hex Code: &#x2205;</p>
  <p>Using HTML Code: &#8709;</p>
  <p>Using HTML Entity: &empty;</p>
  <p id=point>Using CSS Entity: </p>
  <p>The empty set &#x2205; has no elements.</p>
  <p>For all sets A, &#x2205; &#x2286; A.</p>
</body>
</html>

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HTML Entity for Empty Set (∅)