traffic light

/T R AE1 F IH0 K L AY1 T/
noun
  1. 1

    A signalling device positioned at a road intersection or pedestrian crossing to indicate when it may be safe to drive, ride or walk, using a universal colour code.

  2. 2

    The coloured dots on stamp sheet margins printed with offset litho or photogravure methods, used by the printers to check colour accuracy.

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Source: https://en.wiktionary.org/wiki/traffic%20light