dummy

(communications) Telegraphy network simulating a customer's loop for adjusting a telegraph repeater; the dummy side of the repeater is that toward the customer.
(computer science) An artificial address, instruction, or other unit of information inserted in a digital computer solely to fulfill prescribed conditions (such as word length or block length) without affecting operations.
(engineering) Simulating device with no operating features, as a dummy heat coil.
(graphic arts) A preliminary layout which shows the placement of illustrations and text as they will appear in the final printing.
(metallurgy) A cathode that undergoes electroplating at low current densities.
(ordnance) ord A nonexplosive bomb, projectile, or the like, or an object made to appear as one of these. An object made to appear as an airplane, gun emplacement, or the like from the air.

n. pl. -ies 1. a figure used as a target in shooting or bayonet practice or in safety tests for vehicles: crash-test dummies.

2. an object designed to resemble and serve as a substitute for the real or usual one.

3. a blank round of ammunition.

See the Introduction, Abbreviations and Pronunciation for further details.