Any construct that acts to produce copies of itself this could be a living ORganism, an idea (see meme), a program (see quine, wORm, wabbit, fORk bomb, and virus), a pattern in a cellular automaton (see life), OR (speculatively) a robot ORnanobot. It is even claimed by some that Unix and C are the symbiotic halves of an extremely successful replicatOR see Unix conspiracy. [Jargon File]