Look up observer in Wiktionary, the free dictionary.

Observer may refer to person who is observing. More specialised meanings follow.

Computer science and information theory[link]

• 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
• ObserverNMS (software), a network management software package

Fiction[link]

• Observer (Mystery Science Theater 3000), aka Brain Guy
• Observers, non-linear beings in the television show Fringe

Music[link]

• "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

Physics[link]

• Observer (physics)
• Observer (special relativity), a notion from the special relativity theory
• Observer (general relativity)
• Observer (quantum physics)

Politics and diplomacy[link]

• Observer status, granted by an organization to a non-member, allowing the non-member limited ability to participate in the organization's activities
• An election observer, one who assists in election monitoring

Publications[link]

• The Observer, a UK Sunday newspaper
• The Texas Observer, an American political magazine
• A Sri Lankan Sunday and evening newspaper
• The Observer (disambiguation), various newspapers

Other[link]

• A game official used in some competitions of Ultimate
• The Observer personality type
• Air observer, an aircrew member of a (usually military) aircraft

See also[link]

• Observer effect (disambiguation)

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