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

fa-btc · Unicode: f15a · Created: v3.2 · Categories: Currency Icons, Brand Icons · Aliases: fa-bitcoin

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

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

Looking for more? Check out the examples.