bubble on the roof


Senior Member
A car was coming. Black and white. A cop car. <..>. A spotlight on the pillar, and a bubble on the roof, like a little red hat.

Source: No Middle Name by Lee Child
Context: Reacher and Neagly were examining the crime scene where police state car rolled on.

I googled up pictures of car pillars (a-pillar seems to be used for fastening spotlight) and the literal meaning of bubble.

Thank you.
  • Myridon

    Senior Member
    English - US
    Older police cars had a single round red light on top shaped much like a bubble. It was frequently referred to as a "cherry."
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