Starfleet Records: Canon. The definition of Star Trek canon varies from fan to fan, making the question of what is and is not canon especially difficult for reference sources. The term fanon is used to refer to "fan canon", of which the term is a portmanteau. It applies to certain ideas that have been accepted as fact by a large number of fans, and thus either replace an established canonical fact in the minds of those fans, becoming retroactive continuity, or fill a plot-hole. The Enterprise se