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real projective plane
(geometry) A three-dimensional vector space over the field of real numbers in which one-dimensional linear subspaces are considered as “points” and two-dimensional linear subspaces are considered as “lines”. Equivalently, a sphere in which pairs of antipodal points are considered as “points” and great circles are considered as “lines”.
first angle projection
(uncountable) A method of technical drawing where the front view of the object is placed in the first quadrant, the side view is to the left, and the top view is below it. (More common in Europe and Asia.)
first angle projections
third angle projection
(uncountable) A method of technical drawing where the front view of the object is placed in the third quadrant, the side view is to the right, and the top view is above it. (More common in North America.)