The term “2-slot non-polarized” is used for a type of 2 prong power cord where the two prongs are the same size so that it can be plugged into the outlet in any direction. This type of cords are often found on small appliances with double insulation which do not need grounding or polarization (one prong wider than another). Non-polarized cords may be handy, but must be matched with appropriate devices as instructed by manufacturer.