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<!DOCTYPE html>
<html>
<head>
  <style>#point::after{content:"\03A3"}</style>
</head>
<body>
  <h1>Greek Capital Sigma (Σ)</h1>
  <p>Hex: &#x03A3;</p>
  <p>Decimal: &#931;</p>
  <p>Named: &Sigma;</p>
  <p>Statistics: &Sigma; = population std. dev.</p>
  <p id=point>CSS: </p>
</body>
</html>

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HTML Entity for Sigma (Σ)