turret light
n.— «None of the unmarked police cars on the street displayed “turret lights.”» —“Three Men Who Had No Reason to Run” by Jim Dwyer New York Times Apr. 5, 2008. (source: Double-Tongued Dictionary)
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Turret light may refer to the turret shaped red or blue lights on the roof of some Police cars. Sometimes removable – possibly via strong magnets – and may be related to the term “Kojak Light”