KISS is an acronym for "Keep it simple, stupid" as a design principle noted by the U.S. Navy in 1960.
Origin
The acronym was reportedly coined by Kelly Johnson, lead engineer at the Lockheed Skunk Works (creators of the Lockheed U-2 and SR-71 Blackbird spy planes, among many others).
While popular usage has translated it for decades as, 'Keep it simple, stupid', Johnson translated it as, 'Keep it simple stupid' (no comma), and this reading is still used by many authors. There was no implicit meaning that an engineer was stupid; just the opposite.
The principle is best exemplified by th...