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

fa-strikethrough · Unicode: f0cc · Created: v2.0 · Categories: Text Editor Icons

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

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

Looking for more? Check out the examples.