Elusive Icons is a webfont that can be used with any of your projects. There are 270 Sleek vector icons for bootstrap. Bootstrap-based, Foundation-based or even your custom projects. It was created by the need for an Open-Source font that can be used in your projects without licencing issues and/or other “attribution” claws.
If you don’t care much about licences there are many alternatives you can use, most notably the font-awesome font. When downloading this font you’ll also receive all the icons in .svg vector format so you can play with them, improve them and contribute them back on github.