If you like Font Awesome, you're going to love Black Tie!
             

fa-undo · Unicode: f0e2 · Created: v2.0 · Categories: Text Editor Icons · Aliases: fa-rotate-left

After you get up and running, you can place Font Awesome icons just about anywhere with the <i> tag:

fa-undo
<i class="fa fa-undo"></i> fa-undo

Looking for more? Check out the examples.