projective plane
Definition from Wiktionary, the free dictionary
English[edit]
Noun[edit]
projective plane (plural projective planes)
 (geometry) A plane in which any pair of distinct points determine a line and any pair of distinct lines intersect at a point.

2004, David S. Dummit & Richard M. Foote, chapter 6, in Abstract Algebra^{[1]}, ISBN 0471433349, page 210:
 Generally, a projective plane of "order" N has points, and the same number of lines.
