a wooden or plastic triangle used to arrange the balls at the start of a game of billiards, pool, snooker, etc.
in the past, a device to which people were tied that stretched their bodies by pulling their arms in one direction and their legs in the other direction, usually used as a way of forcing them to give information
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a bar with tooth-like parts along one edge that fits into a pinion (= a wheel with tooth-like parts) allowing change between circular and straight-line movement
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