The following code shows how to mark euro icon.
<!DOCTYPE html>
<html>
<head>
<link rel="stylesheet" type="text/css"
href="http://netdna.bootstrapcdn.com/font-awesome/3.2.1/css/font-awesome.css">
<style type='text/css'>
a {<!--from w w w .j av a2 s. c om-->
color: #999;
font-weight: 600;
line-height: 22px;
font-size: 12px;
border-bottom: 1px solid #d7d9d9;
border-top: 1px solid #fafafa;
display: block;
padding: 8px;
}
body {
font: normal 16px/1.6em "Open Sans", Arial, Helvetica, sans-serif;
color: #404545;
background-color: #f5f5f5;
width: 100%;
}
a {
color: #3187c7;
text-decoration: none;
}
</style>
</head>
<body>
<a href="#"><i class="icon-euro icon-2x"></i> Billing</a>
</body>
</html>