Definition of "Grid" :

noun: a cooking utensil of parallel metal bars; used to grill fish or meat

noun: an electrode placed between the cathode and anode of a vacuum tube to control the flow of electrons through the tube

noun: a perforated or corrugated metal plate used in a storage battery as a conductor and support for the active material

noun: a system of high tension cables by which electrical power is distributed throughout a region

noun: a pattern of regularly spaced horizontal and vertical lines