GRID

noun Etymology: back-formation from ~iron Date: 1839 grating , 2. a. a perforated or ridged metal plate used as a conductor in a storage battery, an electrode consisting of a mesh or a spiral of fine wire in an electron tube, a network of conductors for distribution of electric power, a network of uniformly spaced horizontal and perpendicular lines (as for locating points on a map), ~iron 3, the starting positions of cars on a racecourse, a device in a photocomposer on which are located the characters to be exposed as the text is composed