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.

Generation 1

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• Unicron

• Quintesson

• Ancient Autobot

• Ancient Decepticon

• Ancient Autobot/Decepticon

(Dreamwave continuity)

• War Within Autobot

• War Within Decepticon

• Autobot

(In G1 Comic continuity the Autobot symbol was based on the face of the Last Autobot. In the G1 Cartoon it was derived from the Quintesson slave brand) )

• Decepticon (toy & comic)

(It seems likely the Decepticon symbol was originaly based on the head of Soundwave. This jives with evidence that Megatron was a late adition to the line.)

• Decepticon (cartoon)

(In the G1 cartoon the usual 3D detailing of the symbol was interpreted as a third spike in the center of the crest)

• Optimus

• Malignus

• EDC

• Wreckers

G.I. Joe Crossovers

• Cobra

• G.I. Joe

• Decepticon/Cobra

Generation 2

• Seibertron Federation

• Autobot (G2)

(The G2 Autobot symbol seems clearly based on Optimus Prime. In the Comic Continuity this change may have occured since the LAst Autobot had come and gone.)

• Decepticon (G2)

• Cybertronian

Beast Era

• Arachnoid
• Maximal
• BM Maximal
• Predacon
• Seacon Space Pirate
• Blendtron
• Combatron
• Vehicon
• Dinobot
• Mutant
• Transtech Autobot
• Transtech Decepticon

Unicron Trilogy

• Mini-Con
• Unicronian
• Team Optimus
• Team Rodimus
• Team Ironhide
• Cybertron Defence Team

Others

• 1st Transformer
• Go-bots Autobot
• Go-Bots "G"
  
  
  From Teletraan I: The Transformers Wiki, a Wikia wiki.