An empty box is displayed instead of the rupee symbol in HTML

The rupee symbol is the following and not every browser supports it:

₹

To make it visible on your web page:

<link rel="stylesheet" href="//maxcdn.bootstrapcdn.com/font-awesome/4.3.0/css/font-awesome.min.css">
<i class="fa fa-inr"></i>

You can use the following as well:

₹