Insignia

One of the universals across pretty much all Transformers continuities has been the use of Faction Symbols to differentiate members of respective factions, and sometimes even sub-factions within armies.

Known Faction Symbols

Generation 1

Quintesson

Ancient (Dreamwave)

Ancient Autobot

Autobot

Decepticon File:Decept.gif

Optimus

Malignus

EDC

Wreckers

Generation 2

Seibertron Federation

Autobot (G2)

Decepticon (G2)

Cybertronian

Beast Era

Maximal

Predacon

Blendtron

Destronger

Maximal (BM)

Vehicon

Dinobot

Mutant

Unicron Trilogy

Mini-Con

Autobot (Cybertron Defense)

Others

1st Transformer

Go-Bots

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