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HTML Code

<!DOCTYPE html>
<html>
<head>
  <style>#point::after{content:"\4F"}</style>
</head>
<body>
  <h1>Uppercase O (O)</h1>
  <p>Using Hex Code: &#x4F;</p>
  <p>Using Decimal: &#79;</p>
  <p>Using Direct Character: O</p>
  <p id=point>Using CSS Entity: </p>
</body>
</html>

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HTML Entity for Uppercase O (O)