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  1. I guess you ask about the term written as gull words. That is “Unidentified flying Object”.

    The term also gives the official definition. Any flying thing you see that you do not know what is, will be an UFO according to the definition.

    But the practical meaning of the term is somewhat different. It is usually used about flying objects that cannot be usual things like man-made aircrafts, birds, balloons and other conventional objects, and that one does not know further what is. Also if one should happens to know that the object is a vehicle from space, most persons would call it UFO.

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