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An incidence-preserving transformation in which points and lines are transformed into their poles and polars. A Projective Geometry-like Duality Principle holds for reciprocation.
References
Coxeter, H. S. M. and Greitzer, S. L. ``Reciprocation.'' §6.1 in Geometry Revisited.
Washington, DC: Math. Assoc. Amer., pp. 132-136, 1967.