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<!DOCTYPE html>
<html>
<head>
  <style>#point::after{content:"\207A"}</style>
</head>
<body>
  <h1>Superscript Plus (⁺)</h1>
  <p>Using Hex Code: &#x207A;</p>
  <p>Using HTML Code: &#8314;</p>
  <p>Ion charge: Na&#x207A;</p>
  <p id=point>Using CSS Entity: </p>
</body>
</html>

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HTML Entity for Superscript Plus (⁺)