Trisectrix

In geometry, a trisectrix is a curve which can be used to trisect an arbitrary angle. Such a method falls outside those allowed by compass and straightedge constructions, so they do not contradict the well known theorem which states that an arbitrary angle cannot be trisected with that type of construction. There are a variety of such curves and t...
Found on http://en.wikipedia.org/wiki/Trisectrix

trisectrix

A general name for curves that can be used in trisecting an angle. The name 'trisectrix,' on its own, is often applied specifically to the limaçon of Pascal. Other famous trisectrix curves include the Maclaurin trisectrix and the conchoid of Nicomedes.
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