This template allows use of signature templates without substitution of the code. To do this, the signature code should be placed on a user subpage: User:USERNAME/Sig. Then, in the signature box, you should place, User:USERNAME/Sig. This will allow your signature to stay as a template without inserting the raw code onto pages.
I have no frickn idea what this is, but it would amazing if it could be fixed or something. Thanks ;P