An Acronym for Advanced RISC Machines
A series of fast 32-bit CPUs with low power consumption, used widely in embedded systems. Also the name of the IntellectualProperty-only company which owns the design.
The design was created by Acorn for their desktop computers which ultimately failed in the market. ARM was spawned to market the CPU design and went on to become very successful.
DEC developed the StrongARM flavour of the design, which was later sold to Intel.