The ARM processor uses a nomenclature that describes the processor implementations.

The word "ARM" is followed by letters and numbers indicating features of the processor as given below:

ARM {x}{y}{z}{T}{D} {M}{I}{E}{J} {F}{S}

Such that

x:	ARM family
y:	Memory management/protection unit
z:	Cache
T:	Thumb instruction set
D:	Debug via …