Icon font sets have become a new trend in web developments these days. Icon fonts are font files that have symbols and glyphs (usually in form of pictogram) instead of standard alphanumeric characters.
Using these instead of images in your website will give you many advantages. One of the advantages is they have great scalability, means that if you change the icon size, it will still look good. And because they are treated like fonts, they also have great cross browser support (even IE6, for example, can render web fonts using the @font-face rule). You can also change the font and text related CSS properties easily.
Below I have listed some nice pictogram icon font sets for you to use. Be sure to read the terms first to make sure you can use them according to your purpose. Hope this useful.