A superior ability to detect something.
A method of detecting distant objects and determining their position, velocity, or other characteristics by analysis of sent radio waves (usually microwaves) reflected from their surfaces
A type of system using such a method, differentiated by platform, configuration, frequency, power, and other technical attributes.
An installation of such a system or of the transmitting and receiving apparatus.
To scan with radar, or as if with radar.
A message or sign sent by this method.
A method of long-distance communication sometimes used in ancient and undeveloped societies, consisting of messages conveyed by means of columns or intermittent puffs of smoke.
An indirect message or indication, especially concerning a future event.
A type of flare or combustion device sometimes used as a distress signal.