LOGO is an abstract structure, it can be a modern building or a bridge support. It is also a "PA" written vertically.
For your bizcard (back): dark bkg, icon in light color right on the center. Below will be the website name. (front): icon watermarked on the side showing 3/4 of the image, then company name, and detailed info Alternative: the icon could be cut-out (hole in the bizcard) for more modern and expensive look.