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A polygon with three sides and three angles.
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A set square.
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A percussion instrument made by forming a metal rod into a triangular shape which is open at one angle. It is suspended from a string and hit with a metal bar to make a resonant sound.
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(cue sports) A triangular piece of equipment used for gathering the balls into the formation required by the game being played.
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A love triangle.
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(systemics) The structure of systems composed with three interrelated objects.
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A draughtsman's square in the form of a right-angled triangle.
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A frame formed of three poles stuck in the ground and united at the top, to which people were bound when undergoing corporal punishment.
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Any of various large papilionid butterflies of the genus Graphium.
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A triangular formation of railway tracks, with a curve on at least one side.
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