Font Awesome Stacked Icons
https://github.com/FortAwesome/Font-Awesome/issues/8071#issuecomment-161736556
by Juan Muñoz
HTML
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/font-awesome/4.5.0/css/font-awesome.min.css">
<span class="icon fa-stack fa-2x">
<i class="fa fa-circle fa-stack-2x red"></i>
<i class="fa fa-stack-1x text">✕</i>
</span>
CSS
.red {
color: white;
font-size:12px !important;
}
.text{
font-family: "Helvetica";
font-weight: bold;
}
.icon {
position: absolute;
left: 0;
width: 100%;
font-weight:100;
border:1px solid red;
border-radius:50%;
width:55px;
height:50px;
}