Whirlybird feature

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Possible Answers: ROTOR.

Random information on the term “ROTOR”:
ROTOR was a huge and elaborate air defence radar system built by the British Government in the early 1950s to counter possible attack by Soviet bombers. The system was built up primarily of war-era radar systems, and was used only briefly before being eventually replaced by the more modern Linesman/Mediator system.
Taken from Wikipedia