At the FontAwesome website, you find a list of the existing icons: http://fontawesome.io/icons/
If you analyse the html node structure of this website, you find code like this:
<i class="icon fa fa-star-o Button-icon"></i>
... which produces the little star in the
The CSS for that looks like:
font: 14px FontAwesome;
That's all there is. The examples page of FontAwesome (http://fontawesome.io/examples/) shows you, how you can animate, rotate and flip as well as stack different icons. If you want to experiment with that, use the sijad's pages-extension, which allows to include html-code and custom styles, so you can easily test the outcome.