A system for presenting on a plane surface the spherical surface of the earth or the celestial sphere; some of these systems are conic, cylindrical, gnomonic, Mercator, orthographic, and stereographic. Also known as map projection.

1. The continuous map for a fiber bundle.

2. Geometrically, the image of a geometric object or vector superimposed on some other.

3. A linear map P from a linear space to itself such that P ° P is equal to P.

Ascribing one's motives to someone else to disguise a source of conflict in oneself.