hey, this is a HARDWARE question!!
it can be "PowerPC", the cpu that is developed by IBM / Freescale (Motorola). It's used in most current Apple products (such as iBook G4, iMac G5, Powerbook G4) and the latest Microsoft Xbox 360 game console.
or "Pocket PC", the kind of PDA (Personal Digital Assistant) that runs Microsoft Windows CE / Mobile / Pocket PC 200X operating system.