ARM Versions are the architectural version numbers. ARM architecture versions always use the ARMv# notations. Architecture versions are often confused with the various ARM implementations which historically used similar notations ARM#. Note that for the implementations, the number does not necessarily correlates to the architecture version used.

ISA	Microarchitecture
ARMv1	ARM1
ARMv2	ARM2
ARMv2a	ARM250, ARM3
ARMv3	ARM6, ARM7
ARMv4	ARM7TDMI, ARM8, ARM9TDMI, StrongARM
ARMv5	ARM7EJ, ARM9E, ARM10E, XScale