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FBI Special Agent Fox Mulder under a triangular UFO in 1993.

UFO is an abbreviation for Unidentified Flying Object. Technically, a UFO is any object in the air which has not been or cannot be identified. However, the phrase is more commonly used to describe crafts that are of alien origin. — (Deep Throat) et al.

UFOs are frequently witnessed by soldiers during wartime — (E.B.E.). In fact, it is strongly held by believers in UFO phenomena that there is military complicity or involvement in abductions. — (Patient X) A UFO may also be described as a flying saucer, a fallen angel, or a foo fighter — (pilotFallen AngelApocrypha) et al. No other object has been misidentified as a flying saucer more often than the planet Venus. — (José Chung's From Outer Space)

For individual uses of the terms "flying saucer", "fallen angel" and "foo fighter", see Related Terms.