Unicron Trilogy continuity family

Unicron Trilogy is Aaron Archer's designation for the continuity consisting of Armada, Energon, and Cybertron. As such, many fans have taken to using it as the "official" term.

The Unicron Trilogy is so-named because of the central role Unicron plays in the overall story. All three series feature Unicron in some pivotal way, even Cybertron, where his destruction resulted in the creation of the series' primary threat, the Grand Black Hole.

From Teletraan I: The Transformers Wiki, a Wikia wiki.