I686

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The correct title of this article is i686. The initial letter is shown capitalized due to technical restrictions.

i686 is an unofficial name given to the similar instruction sets used by several Intel and Intel-compatible microprocessors based on, or compatible with, the Intel P6 microarchitecture. It is not an official Intel designation but a shorthand derived from the fact that the P6 microarchitecture is two generations on from Intel's i486 instruction set, which was the last to use that numerical nomenclature officially. The name is often used when configuring compilers.

Much debate has resulted about whether these processors should be referred to as i686 processors. Some feel that today's processors should not even be called "x86 compatible".^{[citation needed]} However, most would agree that this term is still in common use, correct or not.