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<!DOCTYPE html>
<html>
<head>
  <style>#point::after{content:"\5F"}</style>
</head>
<body>
  <h1>Underscore (_)</h1>
  <p>Named: &lowbar;</p>
  <p>Hex: &#x5F;</p>
  <p>Decimal: &#95;</p>
  <p>snake_case: user_name</p>
  <p id=point>CSS: </p>
</body>
</html>

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HTML Entity for Underscore (_)