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

fa-rub · Unicode: f158 · Created: v4.0 · Categories: Currency Icons · Aliases: fa-ruble, fa-rouble

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

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

Looking for more? Check out the examples.