<!DOCTYPE html>
<html lang="en-US">
<head>
<style>
#point:after{
content:"\000B1";
}
</style>
</head>
<body>
<p>Plus or Minus using Hexa Decimal: ±</p>
<p>Plus or Minus using HTML Code: ±</p>
<p>Plus or Minus using HTML Entity: ±</p>
<p id="point">Plus or Minus using CSS Entity: </p>
</body>
</html>