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

fa-mercury · Unicode: f223 · Created: v4.3 · Categories: Gender Icons

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

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

Looking for more? Check out the examples.