A point-to-line and line-to-point transformation which transforms points 
into lines 
and lines 
into points 
such that 
passes through 
iff 
lies on 
.
Geometric Correlation
See also
Line, Point, Polarity, Projective CorrelationExplore with Wolfram|Alpha
References
Coxeter, H. S. M. "Collineations and Correlations." §14.6 in Introduction to Geometry, 2nd ed. New York: Wiley, pp. 247-252, 1969.Referenced on Wolfram|Alpha
Geometric CorrelationCite this as:
Weisstein, Eric W. "Geometric Correlation." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/GeometricCorrelation.html