grid
A mat of crossed reinforcing bars for incorporation in a concrete footing; a grillage. 2. The plan, section, or elevation of the four inch module spacing over which a working drawing is made. 3. A steel structure above the stage of a theater, from which hung scenery and equipment are manipulated. Also called grid. 4. A rectangular system of lines and coordinates serving as a reference for locating and regulating the elements of a plan. (Saylor, 1952)