Wikipedia defines a Quine as a computer program which takes no input and produces a copy of its own source code as its only output.

TiddlyWiki is an unusual example of a practical quine: it is this ability to produce a copy of its own source code that lies at the heart of TiddlyWiki's ability to independently save changes to itself.

"Quine" is also the name of the unofficial TiddlyWiki application for iPhone/iPad