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A 2-D Affine Geometry constructed over a Finite Field.  For a Field 
 of size 
, the affine plane
consists of the set of points which are ordered pairs of elements in 
 and a set of lines which are themselves a set of
points.  Adding a Point at Infinity and Line at Infinity allows a Projective Plane to be constructed
from an affine plane.  An affine plane of order 
 is a Block Design of the form (
, 
, 1).  An affine
plane of order 
 exists Iff a Projective Plane of order 
 exists.
See also Affine Complex Plane, Affine Connection, Affine Equation, Affine Geometry, Affine Group, Affine Hull, Affine Space, Affine Transformation, Affinity, Projective Plane
References
Lindner, C. C. and Rodger, C. A.  Design Theory.  Boca Raton, FL: CRC Press, 1997.