The subject of this article has been mentioned only and never actually shown in a comic book or on-screen. Despite their lack of physical appearances, information about them might still be relevant or interesting or at least worthy of documentation. Anything known about them is to be considered second-hand information.
The Titans were mentioned only in Static Shock, to explain the absence of Robin. Whether they're the Titans or the Teen Titans was never revealed. Later, an allusion was made to "the green one" in the Titans; this is generally presumed to be Beast Boy.