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

fa-microphone-slash · Unicode: f131 · Created: v3.1 · Categories: Web Application Icons

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

fa-microphone-slash
<i class="fa fa-microphone-slash"></i> fa-microphone-slash

Looking for more? Check out the examples.