A twofer is a cabling device used in theatrical stage lighting. It allows two stage lighting instruments to be connected to one circuit. It is wired in parallel, such that voltage is unchanged in the twofer, and current is split and divided over two connectors. Twofers are used in conjunction with cables with the same types of connectors. The name is a corruption of the phrase "Two For One".
And the same with 3-FERS .....
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