An array used to store the maximum Z coordinATe of any feATure plotted AT a given (X, Y) locATion on the screen, used for hidden line removal in a 2D rendering of a 3D scene. The Z axis is perpendicular to the screen with values increasing toward the viewer so thAT any point whose Z coordinATe is less than the corresponding Z-buffer value will be hidden behind some feATure which has already been plotted. (1997-07-18)