Observer

An observer is one who engages in observation or in watching an experiment.

Observer may also refer to:

Computer science and information theory

• In information theory, any system which receives information from an object
• A state observer in control theory, a system that models a real system in order to provide an estimate of its internal state
• Observer pattern, a design pattern used in computer programming

Fiction

• Observer (Mystery Science Theater 3000), a fictional television character
• Observers, beings in the television show Fringe

Music

• "Observer", a song by Gary Numan on his album The Pleasure Principle
• "The Observer", a track from The Flaming Lips' 1999 album The Soft Bulletin
• The Observers, alternative name for reggae session band Soul Syndicate when working with Winston Holness (a.k.a. Niney the Observer).

Physics

• Observer (physics)
• Observer (special relativity)
• Observer (general relativity)
• Observer (quantum physics)
• Observator (astronomy)

Politics and diplomacy

• Observer status, granted by an organization to allow a non-member limited participation
• An election observer, one who assists in election monitoring

Publications

• The Observer, a UK Sunday newspaper
• The Texas Observer, a political magazine
• Sunday Observer (Sri Lanka), a weekly newspaper
• Observer, a member magazine of Association for Psychological Science
• The Observer (disambiguation), any of various periodicals

Other

• A game official sometimes used in the sport Ultimate
• The Observer type in the Enneagram of Personality model
• Air observer, an aircraft crew role
• Observer Radio, a radio station from St. John's, Antigua and Barbuda

See also

• Observer effect (disambiguation)