I recall Wang Computers using coax cables and BNC Connectors. What could this be. It's in almost every room on at least on set of electrical outlets of a 1970s era college campus building.
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Spoken like another of us 'ancient' techies....Video distribution. I work at a university and we have a lot of 1970's era buildings with the same stuff. No longer used of course, and if I recall correctly, it was all 75 ohm cable.
ThinNet used BNC, thick net used N. Neither of them used UHF connectors. Cables were all 50 ohm, also. Easy way to tell what that was would be to look at the cable.