Projection

The word projection can mean more than one thing.

• In cartography, a map projection
• In psychology, psychological projection
• 3D projection, Orthographic projection and isometric projection are ways of representing 3D scenes in 2D
• In mathematics a projection is a linear transformation which remains unchanged if applied twice (), such as that taking (x, y, z) in three dimensions to (x, y, 0) in the plane or generalisations of this in other dimensions. See orthogonal projection.
• In cinematography, projection is the display of a movie in a theater using a film projector, which is likely to be replaced by digital projection

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