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signal

noun [C] (EQUIPMENT)
 
 
/ˈsɪɡ.nəl/

Definition

equipment, especially on the side of a railway or road, often with lights, that tells drivers to stop, continue, or go more slowly: a railway signal a traffic signal a road signalRailways and railway linesLights, signs and markings on roads
(Definition of signal noun (EQUIPMENT) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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