Squawk

A radio communication term used by ATC to instruct a pilot to set a specific four-digit code on the aircraft transponder. For example, "Squawk 4512" means set code 4512. Standard VFR squawk is 1200. Emergency codes include 7500 (hijack), 7600 (communication failure), and 7700 (emergency). "Squawk ident" means press the transponder identification button for radar identification.