<!DOCTYPE html>
<html lang="en-US">
<head>
<style>
#point:after{
content:"\0221F";
}
</style>
</head>
<body>
<p>Right Angle using Hexa Decimal: ∟</p>
<p>Right Angle using HTML Code: ∟</p>
<p>Right Angle using HTML Entity: ∟</p>
<p id="point">Right Angle using CSS Entity: </p>
</body>
</html>