Full form of CPU

This question could mean a large number of things.

1. Full form of "CPU" - Central Processing unit

2. Full 'form' of CPU - A highly complex composition of transistors arranged intelligently in order to carry out a large number of individual tasks, ranging from performing calculations to storing data.

3. Full form of CPU - Small square with hundreds of small golden pins on the bottom with a thin green band of silicon along the middle. The top is typically covered with a thick metal shielding / thermal plate, with emblems and information etched into the top.