The font icons are progressively more popular. Users probably would like to add some icons in the content. As easily like we apply a style to a paragraph, or we add a symbol or an image, we should be able to add an icon of a font configured in the skin.

The font icons used in projects could be awesome's font or icomoon's compositions.

Note that, this fonts icons are sometimes included in the project (for intranet for example) or just linked to the web font.