A recent project I’ve been working on already had used this little icon font called “Font Awesome,” which as it turns out was created for Bootstrap implementations. It’s comprised of 361 icons. The big advantage is that it can be customized (size, color, drop shadows, etc.) via CSS and should look good on any size screens.
Since it’s used on a lot of Bootstrap-built sites, if you’re linking to a CDN, odds are your users already have it cached as well, for a nice page speed bump as well.
I’ve been referencing this Cheat Sheet quite awhile.