<!DOCTYPE html>
<html lang="en-US">
<head>
<style>
#point:after{
content:"\0207B";
}
</style>
</head>
<body>
<p>Superscript Minus using Hexa Decimal: ⁻</p>
<p>Superscript Minus using HTML Code: ⁻</p>
<p id="point">Superscript Minus using CSS Entity: </p>
</body>
</html>