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HTML Code

<!DOCTYPE html>
<html>
<head>
  <style>#letter::after{content:"\0055"}</style>
</head>
<body>
  <h1>Uppercase U (U)</h1>
  <p>Using Hex Code: &#x55;</p>
  <p>Using Decimal: &#85;</p>
  <p>Using Direct Character: U</p>
  <p id=letter>Using CSS Entity: </p>
  <p>Text: User, Update, United</p>
</body>
</html>

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HTML Entity for Uppercase U (U)