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plural unidentified flying objects
Definition of unidentified flying object
: a mysterious flying object in the sky that is sometimes assumed to be a spaceship from another planet
The Peking Evening News said today that it was swamped with telephone calls from people reporting an "unidentified flying object" over the city. The bright round object spotted yesterday turned out to be a research balloon reflecting the sunlight, the newspaper said. — The New York Times
— called also UFO
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Merriam-Webster unabridgedWords at Play
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Time Traveler for unidentified flying object
The first known use of unidentified flying object was in 1947
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