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When I first started using PCs in the early 80s, I recall that the beige box
was referred to as the "system unit" by at least one of the manuals I read.
That seems to be a more accurate term than most I've seen posted lately.
BTW, the "pizza box" monniker suggested by one poster is probably confusing
to most of us whose "system units" are housed in a tower or AT-type chassis.