<!DOCTYPE html>
<html lang="en-US">
<head>
<style>
#point:after{
content:"\02070";
}
</style>
</head>
<body>
<p>0 superscript using Hexa Decimal: ⁰</p>
<p>0 superscript using HTML Code: ⁰</p>
<p id="point">0 superscript using CSS Entity: </p>
</body>
</html>