Points which are transformed into each other through Inversion about a given Inversion Circle. The point which is the inverse point of a given point with respect to an Inversion Circle may be constructed geometrically using a Compass only (Courant and Robbins 1996).
See also Geometric Construction, Inversion, Polar, Pole (Geometry)
Courant, R. and Robbins, H. ``Geometrical Construction of Inverse Points.''
§3.4.3 in What is Mathematics?: An Elementary Approach to Ideas and Methods, 2nd ed.
Oxford, England: Oxford University Press, pp. 144-145, 1996.