<!DOCTYPE html>
<html lang="en-US">
<head>
<style>
#point:after{
content:"\0229F";
}
</style>
</head>
<body>
<p>Squared Minus using Hexa Decimal: ⊟</p>
<p>Squared Minus using HTML Code: ⊟</p>
<p>Squared Minus using HTML Entity: ⊟</p>
<p id="point">Squared Minus using CSS Entity: </p>
</body>
</html>