Any hardware COMponent that allows a user to input spatial data to a COMputer. CAD systems and {Graphical User Interfaces} (GUI) allow the user to control and provide data to the COMputer using physical "gestures" - point, click, and drag - typically by moving a hand-held mouse across the surface of the physical desktop and activating switches on the mouse. Movements of the pointing device are echoed on a graphical representation of a desktop on the screen by movements of the mouse pointer and other visual changes. While the most COMmon pointing device by far is a mouse, other kinds include tracker ball, trackpad, lightpen, various kinds of digitising tablets which use a stylus, and even a special "data glove" that translates the user' s movements to COMputer gestures. (1997-02-03)