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<!DOCTYPE html>
<html>
<head>
  <style>#point::after{content:"\223F"}</style>
</head>
<body>
  <h1>Sine Wave (∿)</h1>
  <p>Hex: &#x223F;</p>
  <p>Decimal: &#8767;</p>
  <p>Named: &acd;</p>
  <p>Trigonometry: f(x) &#x223F; sin(x)</p>
  <p id=point>CSS: </p>
</body>
</html>

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HTML Entity for Sine Wave (∿)