Projection or projections 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

Graphics and cartography

  • 3D projection, the production of a two-dimensional image of a three-dimensional object
  • Map projection, reducing the surface of a three-dimensional planet to a flat map

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
  • Vector projection, orthogonal projection of a vector onto a straight line
  • Projection (relational algebra)<!-- This item used only in a very specialized area, thus, please, keep it at the end -->, a type of unary operation in relational algebra
  • 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 bias that leads people to believe others are similar to themselves
  • Forecasting, making predictions of the future based on past and present data
  • Population projection, in the field of demography, an estimate of a future population

See also

  • Project (disambiguation)
  • Projection effect (disambiguation)
  • Projector (disambiguation)
  • Projective (disambiguation)