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

fa-superscript · Unicode: f12b · Created: v3.1 · Categories: Text Editor Icons

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

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

Looking for more? Check out the examples.