CE5, which stands for 'Close Encounter of the 5th Kind'...
…is a term describing a fifth category of close encounters with Extraterrestrial Intelligence (ETI), characterized by mutual, bilateral communication rather than unilateral contact. CE types 1-4 are essentially passive, reactive and ETI initiated; CE-5 is distinguished from these by conscious, voluntary and proactive human-initiated or cooperative contacts with ETI.
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