System unit

<hardware> The main body of a computer, consisting of a plastic or metal enclosure, the motherboard, and (typically) internal disk drives, a power supply, cooling fans, and whatever circuit boards plugged into the mother board, such as a video card.

The system unit is occasionally referred to as the CPU, though this really means central processing unit.

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system software
systems operator
systems programmer
systems programming
system testing
system unit
System V
System V Interface Definition
systolic array