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Substantiivit

1. (geometry) A polygon with three sides and three angles.
2. (music) 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.
3. (cue sports) A triangular piece of equipment used for gathering the balls into the formation required by the game being played.
4. A love triangle.
5. (systemics) The structure of systems composed with three interrelated objects.
6. A draughtsman's square in the form of a right-angled triangle.
7. (historical) A frame formed of three poles stuck in the ground and united at the top, to which soldiers were bound when undergoing corporal punishment.