That's where the U comes from in UFO
That's not what it originally referred to though is it :
The term "UFO" was first suggested in 1952 by Capt. Edward J. Ruppelt, who headed Project Blue Book, then the USAF's official investigation of UFOs. Ruppelt felt that "flying saucer" did not reflect the diversity of the sightings. He suggested that UFO should be pronounced as a word you-foe.



