Linked from
The 34 pages that link to Instruction set architecture, each with the reason it gives.
IntelNarrower topic: Intel’s processor designs implement an architecture that software can target.
x86Narrower topic: x86 is one long-lived family of these software-visible specifications.
Instruction cycleNarrower topic: It defines what instructions the cycle must interpret and support.
ExecutableNarrower topic: An executable's machine code must match the processor's instruction set.