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The question of what to call the "beige box" intrigued me, so I did a
survey here at work (I work for a company that develops software). The
answers I got varied depending on the technical background of the
respondent. Engineers tended to call it a "chassis" or use a variation of
chassis, such as PC Chassis and Computer Chassis. Administrators tended
to call it the Box or the PC (one even called it the CPU).
Personally, I like "PC chassis" -- that way I can distinguish it from the
empty "case" and still keep it separate from the keyboard, monitor and
mouse.