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<!DOCTYPE html>
<html>
<head>
  <style>#point::after{content:"\211D"}</style>
</head>
<body>
  <h1>Uppercase R Double Struck Capital (ℝ)</h1>
  <p>Using Hex Code: &#x211D;</p>
  <p>Using Decimal: &#8477;</p>
  <p>Using Named Entity: &Ropf;</p>
  <p id=point>Using CSS Entity: </p>
  <p style="font-family:Cambria Math,serif">x ∈ ℝ</p>
</body>
</html>

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HTML Entity for Uppercase R Double Struck Capital (ℝ)