<!DOCTYPE html>
<html lang="en-US">
<head>
<style>
#point:after{
content:"\02115";
}
</style>
</head>
<body>
<p>Uppercase N Double Struck Capital using Hexa Decimal: ℕ</p>
<p>Uppercase N Double Struck Capital using HTML Code: ℕ</p>
<p>Uppercase N Double Struck Capital using HTML Entity: ℕ</p>
<p id="point">Uppercase N Double Struck Capital using CSS Entity: </p>
</body>
</html>