Projection

Projection ( proicere Latin, throw out, throw ') stands for:

Projection (mathematics), an idempotent linear mapping
Central projection, the image of a three-dimensional object on a two dimensional surface
Card network design, map projection, the image of the curved surface of a celestial body on a flat map
Projection (optics), the image of an object or its image on an image plane by a lens or lens system
Projection ( reproduction technology ), a method in the process camera with large format posters
Projection ( psychoanalysis ), the unconscious displacement own wishes, feelings or ideas to other people or objects
Projection ( nervous system), movement of a sensory impression to a specific location of the nervous system, like motor projection
Projection (statistics ), a method to derive a third value of two statistical values
In computer science selecting attributes from a relation, see Relational Algebra # projection
In linguistics / Linguistics disclosure of features in a structure, see head ( grammar)