
Another widely known acronym for UFO in Spanish, French, Portuguese and Italian is OVNI (Objeto Volador No Identificado, with variant regional spellings). Some investigators now prefer to use the broader term unidentified aerial phenomenon (or UAP), to avoid the confusion and speculative associations that have become attached to UFO.

UFO enthusiasts and devotees have created organizations, religious cults have adopted extraterrestrial themes, and in general the UFO concept has evolved into a prominent mythos in modern culture. Declassified records prove that the UFO topic is one of the most highly classified and most elusive subjects the U.S. sighting, reported by private pilot Kenneth Arnold in June 24 1947, that gave rise to the popular terms "flying saucer" and "flying disc." The term UFO is popularly taken as a synonym for alien spacecraft and generally most discussions of UFOs revolve around this presumption. Inside The Black Vault: The Government’s UFO Secrets Revealed takes you on a journey within the secret world of unidentified aerial phenomenon that has plagued the military since at least the 1940s. Air Force was the primary investigator of.

UFO reports increased precipitously after the first widely publicized U.S. In 1947, a rash of sightings of unexplained flying objects (UFOs) swept America. The United States Air Force, which coined the term in 1952, initially defined UFOs as those objects that remain unidentified after scrutiny by expert investigators, though today the term UFO is colloquially used to refer to any unidentifiable sighting regardless of whether it has been investigated. Unidentified flying object (commonly abbreviated as UFO or U.F.O.) is the popular term for any apparent aerial phenomenon whose cause cannot be easily or immediately identified by the observer.
