<!DOCTYPE html>
<html lang="en-US">
<head>
<style>
#point:after{
content:"\021D1";
}
</style>
</head>
<body>
<p>Up Double Arrow using Hexa Decimal: ⇑</p>
<p>Up Double Arrow using HTML Code: ⇑</p>
<p>Up Double Arrow using HTML Entity: ⇑</p>
<p id="point">Up Double Arrow using CSS Entity: </p>
</body>
</html>