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<!DOCTYPE html>
<html>
<head>
  <style>#point::after{content:"\2621"}</style>
</head>
<body>
  <h1>Caution Sign (☡) in HTML</h1>
  <p>Using Hex Code: &#x2621;</p>
  <p>Using HTML Code: &#9761;</p>
  <p>Bourbaki: &#x2621; This proof requires careful reading.</p>
  <p id=point>Using CSS Entity: </p>
  <p>Not the same as Warning &#x26A0; or Radioactive &#x2622;</p>
</body>
</html>

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HTML Entity for Caution Sign (☡)