<!DOCTYPE html>
<html lang="en-US">
<head>
<style>
#point:after{
content:"\02080";
}
</style>
</head>
<body>
<p>0 subscript using Hexa Decimal: ₀</p>
<p>0 subscript using HTML Code: ₀</p>
<p id="point">0 subscript using CSS Entity: </p>
</body>
</html>