The ARM is a computer instruction set architecture (ISA) developed by ARM Holdings. An instruction set is a list of all the instructions that a processor can execute (e.g. add, subtract, move, load, store, etc.). It was known as the Advanced RISC Machine, and before that as the Acorn RISC Machine. The ARM architecture is the most widely used ISA.
In 2005, about 98 percent of the more than one billion mobile phones sold each year used at least one ARM processor. ARM processors are used extensively in consumer electronics, including PDAs, mobile phones, digital media and music players, hand-held game consoles, calculators and computer peripherals such as hard drives and routers.
The Daily Omnivore 
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