What is a close encounter of the third kind ( CE-3) ?
Ufologists call a direct contact between a man and a UFO occupants. It is part of a classification by Josef Allen Hynek from 1972, which defines four "types" of close encounters with UFOs. Hynek's original scale was developed in the course of the history of ufology several times.
There is also a famous movie with the same title:
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