<!DOCTYPE html>
<html lang="en-US">
<head>
<style>
#point:after{
content:"\0212A";
}
</style>
</head>
<body>
<p>Kelvin Sign using Hexa Decimal: K</p>
<p>Kelvin Sign using HTML Code: K</p>
<p id="point">Kelvin Sign using CSS Entity: </p>
</body>
</html>