Wig-wag

[sound stage] A wig-wag is the red light (also known as a "red-eye") near each door of a motion picture sound stage. It flashes to indicate that cameras are rolling inside the stage and all people and vehicles outside should remain quiet. A flashing wig-wag is accompanied by one long buzzer when the cameras start rolling, and two shorter bu
Found on http://en.wikipedia.org/wiki/Wig-wag_(sound_stage)

Wig-wag

[automobile] A wig-wag is a device for flashing an automobile`s headlights at a preset rate. Traditionally, the wig-wag will flash the right and left headlights (often the high-beams) alternately, but some designs will flash both headlights on and off together. More complex wig-wags may cycle through several patterns, such as swiftly altern
Found on http://en.wikipedia.org/wiki/Wig-wag_(automobile)
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