Font Awesome 4 is installed in Parallaxis and we can use it's icons in the content areas as well as in Parallaxis Menu, as shown in the Tutorial Project.
Read the following notes about updating from version 3 to 4:
Font Awesome range from web application, text editor, directional, player, social and medical icons.
The full list of Font Awesome is available in Font Awesome website: http://fortawesome.github.io/Font-Awesome/
Use the snippet below as an example:
<i class="fa fa-tablet"></i>
Larger icons can be achieved by using these snippets:
<i class="fa fa-tablet fa-2x"></i>
<i class="fa fa-tablet fa-3x"></i>
<i class="fa fa-tablet fa-4x"></i>