A projection can be any one of the following:

• In cartography, a map projection.

• In chemistry, any one of the following:
  • Fischer projection
  • Haworth projection
  • Newman projection
  • Stereochemical projection

• In cinematography, projection refers to the display of a motion picture in a theater by means of a movie projector, more recently, by a digital projector. Other, similar, types of projection include overhead and slide projection, often used in educational settings.

• In dentistry, enamel projections are focal apical extensions of the coronal enamel beyond the normally smooth cervical margin and on to the root of the tooth.

• In digital identity, a projection is a transaction. See also link contracts.

• In graphical projection, a 3D projection is any one of several ways of representing a three-dimensional scene in two-dimensional form, for instance, isometric projection, oblique projection, and orthographic projection.

• In mathematics, a projection is any one of several different types of functions, mappings, operations, or transformations.

• In military strategy and international relations, projection of force refers to the latent or actualized capacity to win armed contests in distant theatres.

• In neuroscience, the projection of a given neuron is its collective output to other neurons.

• In psychology, psychological projection

• In relational algebra, an interdisciplinary field in the intersection of computer science, database theory, logic, and mathematics, see projection (relational algebra).

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