FontAwesome

Font Awesome gives you scalable vector icons that can instantly be customized — size, color, drop shadow, and anything that can be done with the power of CSS.

Font Awesome licensed under SIL OFL 1.1 · Code licensed under MIT License · Documentation licensed under CC BY 3.0.

Installation
Put the CSS code on you MediaWiki:Common.css or Special:CSS

Features

 * One Font, 369 Icons
 * No JavaScript Required
 * Infinite Scalability
 * Free, as in Speech
 * CSS Control
 * Perfect on Retina Displays
 * Made for Bootstrap
 * Desktop Friendly
 * Screen Reader Compatible

Using FontAwesome
insert a  tag with   class. Example:

Insert icon class... List on Font Awesome.io. Example: