Take your icon game to the next level. Check out Fonticons, from the maker of Font Awesome.
             

fa-cc-mastercard · Unicode: f1f1 · Created: v4.2 · Categories: Brand Icons, Payment Icons

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

fa-cc-mastercard
<i class="fa fa-cc-mastercard"></i>

Looking for more? Check out the examples.