There are two types of icons included – font icons, which are vector files, so can be scaled to any size without quality loss, and image icons, which are 16×16 px (and 32×32 px for Retina displays) raster files. So there are 683 different icons in total included. Have a look at the examples of both types (there is a full list in the template documentation):

Font icons examples:

+ 310 more icons like these above

Graphic icons examples of set one:

+ 145 more icons like these above

Graphic icons examples of set two:

+ 82 more icons like these above

Graphic icons examples of set three:

+ 80 more icons like these above

These icons come from the folowing sources: Entypo, Brandico, PC 100 Icon Pack, pc.de Essen Icon Pack. Thank you.