Noun
stereographic projection (plural stereographic projections)
(projective geometry, complex analysis, cartography) A function that maps a sphere onto a plane; especially, the map generated by projecting each point of the sphere from the sphere's (designated) north pole to a point on the plane tangent to the south pole.
Stereographic projections Stereographic projection of structural strike and dip measurements is a powerful method for analyzing the nature and orientation of deformation stresses, lithological units and penetrative fabrics. Source: Internet
Stereographic approach Stereographic projection of the unit circle onto the x-axis. Source: Internet
Stereographic projection of a 3-sphere (again removing the north pole) maps to three-space in the same manner. Source: Internet