In addition to the default ThemeRoller icon set, the PrimeFaces team provided and supported a set of alternative icons named the Font Awesome iconic font and CSS framework. Originally, it was designed for the Twitter Bootstrap frontend framework. Currently, it works well with all frameworks. The official site for the Font Awesome toolkit is http://fortawesome.github.io/Font-Awesome/.
The features of Font Awesome that make it a powerful iconic font and CSS toolkit are as follows:
One font, 519 icons: In a single collection, Font Awesome is a pictographic language of web-related actions
No JavaScript required: It has minimum compatibility issues because Font Awesome doesn't required JavaScript
Infinite scalability: SVG (short for Scalable Vector Graphics) icons look awesome in any size
Free to use: It is completely free and can be used for commercial usage
CSS control: It's easy to style the icon color, size, shadow, and so on...