A huge set of icons

Glyphicons

200+ HALFLINGS icons

 

See more info and usage guide from: http://glyphicons.com/

Genericons

See more info and usage guide from: http://genericons.com/

 

Font Awesome

The complete set of 369 icons in Font Awesome 4.0.3

 

See more info and usage guide from: http://fortawesome.github.io/Font-Awesome/

…. And much much more…

visit links for more details