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UFO stands for Unidentified Flying Object
It stands for unidentified, UFO is an acronym for Unidentified Flying Object.
a unidentified flying object is often something you don't know what you are seeing is called.
"Objeto volador no identificado" is a Spanish equivalent of unidentified flying object."
Unidentified
Flying
Object
many people think it is unknown flying object, that is right in a way but the most recommended usage answer is UNIDENTIFIED FLYING OBJECT