From The Art and Popular Culture Encyclopedia

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An unidentified flying object, or UFO, is any real or apparent flying object which cannot be identified by the observer and which remains unidentified after investigation. The term flying saucer is also sometimes used, although the two terms are not genuinely interchangeable.

See also

• The UFO (Underground Freak Out) club in London, frequented in the late-1960s by Pink Floyd.
• The Italian UFO design movement