source : http://tfwiki.net/wiki/Universal_stream
Known Universe List:
* Aurex — Unicron Trilogy
* Gargent — Tonka GoBots
* Malgus — TF Animated
* Nexus — TransTech
* Primax — TF Generation 1
* Quadwal — "Real World"
* Tyran — Live-action
* Viron — RiD
Media
* Alpha — animated
* Beta — toy fiction
* Gamma — comic book series
* Delta — motion picture/live action
* Epsilon — club/convention fiction
* Zeta — text stories, storybooks and other prose works (printed)
* Eta — radio/audiocentric universes, books on tape
* Theta — live performance/spoken word
* Iota — Internet-only information (not involved with club/convention)
* Kappa — games (video and otherwise)
Example : Viron 403.0 Alpha - Fire Convoy
Viron - RiD 'Universe'
403.0 - Creation date
Alpha - Animation 'Media'