Flock of circles
This term is related to: incidence geometry
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This term is related to: inversive geometry
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A flock of circles in an inversive plane is a collection of circles such that, with the exception of two points and (which do not lie on any circle in the flock) every other point lies on exactly one circle in the flock. The two points are termed the carriers of the flock.
A flock of circles is also termed an elliptic pencil of circles.