4. Short for Unidentified Aerial Contact, an IOW UFO. The name comes from North American radio echoscope operators during the 1940s, as the sets used at the time were known to malfunction and report the presence of contacts that did not, technically, exist as anything other than errant electrons. The term has since been wholly taken over by the FANTL's conspiracy fringe.
If you're wondering, it's pronounced "you-ac."
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