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The aerodynamics of the roarer will keep it spinning about its axis even after the initial twist has unwound.The cord winds fully first in one direction and then the other, alternating.

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They are used in men's initiation ceremonies, and the sound they produce is considered in some indigenous cultures to represent the sound of the Rainbow Serpent.The greatest pitch variation are caused by the spinning blade's winding up or loosening the cord.When the twist in one direction gets tight enough, the blade spin will slow and then it will reverse its spin and unwind rapidly, and will continue that direction of spin until the cord twist tightens again.A bullroarer was known as a rhombos (literally meaning "whirling" or "rumbling"), both to describe its sonic character and its typical shape, the rhombus.(Rhombos also sometimes referred to the rhoptron, a buzzing drum).

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