Projection, projections or projective may refer to: Physics Projection (physics), the action/process of light, heat, or sound reflecting from a surface to another in a different direction The display of images by a projector Optics, graphics, and cartography Map projection, reducing the surface of a three-dimensional planet to a flat map Graphical projection, the production of a two-dimensional image of a three-dimensional object Chemistry Fischer projection, a two-dimensional representation of a three-dimensional organic molecule Haworth projection, a way of writing a structural formula to represent the cyclic structure of monosaccharides Natta projection, a way to depict molecules with complete stereochemistry in two dimensions in a skeletal formula Newman projection, a visual representation of a chemical bond from front to back Mathematics Projection (mathematics), any of several different types of geometrical mappings Projection (linear algebra), a linear transformation from a vector space to itself such that Projection (set theory), one of two closely related types of functions or operations in set theory Projection (measure theory), use of a projection map in measure theory 3D projection, any method of mapping three-dimensional points to a two-dimensional plane Vector projection, orthogonal projection of a vector onto a straight line Projection (relational algebra), a type of unary operation in relational algebra Projective geometry, the study of geometric properties that are invariant with respect to projective transformations Projective module, a generalization of a free module Projective object, a further generalization, in category theory Projection method (fluid dynamics), means of numerically solving time-dependent incompressible fluid-flow problems Biology Projection areas, areas of the brain where sensory processing occurs Projection fiber, in neuroscience, white matter fibers that connect the cortex to the lower parts of the brain or the spinal cord Linguistics Projection (linguistics), grammatical trait inheritance from a head to a phrasal category Projection principle in syntax Projection of presuppositions in linguistics Arts and entertainment "Projections" (Star Trek: Voyager), an episode of the television series Star Trek: Voyager Projections (The Blues Project album), 1966 Projections (John Handy album), 1968 Projections (film), 2013 Croatian film Other uses Projection (alchemy), process in Alchemy Projections (journal), an interdisciplinary academic journal related to cinema and visual media Power projection, the capacity of a state to implement policy by means of force, or the threat thereof Psychological projection, or "Freudian projection", a defense mechanism in which one attributes to others one's own unacceptable or unwanted attributes, thoughts, or emotions Social projection, a cognitive