ARM

This is the short form for ARM architecture. The ARM, or Acorn RISC Machine, is a 32-bit CPU which is found in many consumer gadgets.

On the iPhone, iPod touch, iPad and Apple TV, there are various processors in use, which all use this architecture:
 * Main processors: S5L8900, S5L8720, S5L8920, S5L8922, S5L8930, S5L8940, S5L8942, S5L8945, S5L8950, and S5L8955.
 * Baseband processors: PMB8876, PMB8878, XMM6180, MDM6600, MDM6610, MDM9x00.

Instruction set
The following Instruction Sets are being used:
 * ARMv6: S5L8900 and S5L8720
 * ARMv7: S5L8920, S5L8922, S5L8930, S5L8940, S5L8942, S5L8945, S5L8950
 * ARMv8: S5L8960 - 64-bit version