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The name for a device used in circuiting multiple lighting instruments into one circuit.

It has three female ends and one male end thus allowing you to get "Three for 1." Also known as a "three-way" or "multiple branch off." Comes in either molded "W" style:
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http://www.4wall.com/1-cable.php

or (becoming rarer each day) as an approx. 3"x4"x1" block:
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This device is sometimes called a
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Best Little "______" in Texas
"Block."

If three lights are to be ganged onto one circuit and no Three-Fers are available, two Two-Fers, one plugged into one of the females of the other, can accomplish the same goal.