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 or nanobot. It is even claimed by some that Unix and C are the symbiotic halves of an extremely successful replicator see Unix conspiracy. [Jargon File]

In addition suitable contents:
[ = ] [ ai ] [ al ] [ am ] [ an ] [ ar ] [ arc ] [ arg ] [ at ] [ au ] [ automaton ] [ b ] [ bb ] [ be ] [ bi ] [ bit ] [ bo ] [ bomb ] [ bot ] [ by ] [ C ] [ ca ] [ cat ] [ cc ] [ cell ] [ cellular automaton ] [ ch ] [ cl ] [ co ] [ con ] [ cons ] [ cu ] [ cy ] [ de ] [ du ] [ ec ] [ ed ] [ ee ] [ er ] [ es ] [ fi ] [ file ] [ fo ] [ for ] [ fork ] [ fork bomb ] [ ga ] [ gr ] [ h ] [ hat ] [ hr ] [ id ] [ ie ] [ il ] [ in ] [ io ] [ ir ] [ is ] [ it ] [ J ] [ Jargon File ] [ la ] [ ld ] [ Lex ] [ li ] [ life ] [ lu ] [ lv ] [ ly ] [ ma ] [ meme ] [ mo ] [ mod ] [ module ] [ na ] [ nanobot ] [ ne ] [ ng ] [ ni ] [ no ] [ ns ] [ om ] [ op ] [ org ] [ pa ] [ pe ] [ ph ] [ piracy ] [ pl ] [ pr ] [ program ] [ query ] [ quine ] [ rc ] [ re ] [ ro ] [ robot ] [ ru ] [ se ] [ sm ] [ so ] [ spec ] [ st ] [ struct ] [ su ] [ sy ] [ th ] [ to ] [ tr ] [ tt ] [ Unix conspiracy ] [ us ] [ ve ] [ vi ] [ virus ] [ wabbit ] [ worm ]