What is a UFO?

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A UFO is technically an "Unidentified flying object," nothing more nor less. Any object that flies and cannot initially be identified as an airplane, helicopter, blimp, balloon,kite, or any other object that normally flies, is a UFO. Many Flying objects that are listed as a UFO can later be identified as an object made on Earth, then they can be called an "IFO", or identified flying object. Is there any other definition for UFO?