Wall Motion Sensor Switch Key What Is The Proper Term For The Size Of GFI Outlets And Rocker Switches?

What is the proper term for the size of GFI outlets and rocker switches? - wall motion sensor switch key

Is there a good word that the size of the wall switch plates, describing / connector that the large rectangular holes must be filled in the issue that concerned because GFI, toggle switches, motion detectors, etc.? I refer to the house, electric equipment.

If this is confusing, you will perhaps make more sense. Watch this link below. Is there a term that describes the size of the outlet / switch?
http://ecx.images-amazon.com/images/I/4128Z4W25XL._SL500_AA280_.jpg

Thank you.