Insignia
One of the universals across all Transformers continuities has been the use of insignia to differentiate members of respective armies, and sometimes sub-factions within armies or even individuals.
Generation 1
Prehistory
Ancient Transformer
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Autobot
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Fallen
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Pre-War Megatron Origin
Clench
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Security Services
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Emirate Xeon
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The Great War
Autobot
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The Autobot symbol as it appeared on Generation 1 toy packaging.
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Decepticon
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The Decepticon symbol as it appeared on Generation 1 toy packaging. Note the bevelled detail in the center of the crest at the top - the model sheet of the symbol created for the G1 cartoon based on this version misinterpreted it as a third spike, and it appeared in the show rendered in this manner almost universally.
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Cybertron Guard
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Wreckers
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Non-Cybertronian Insignia
Quintesson
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Kiss Players
These symbols were used by the Sparkbots in Kiss Play Position.
Brazilian G1
These faction symbols were used in the Brazilian Estrela releases of the Microchange "Mini Car Robo" subline molds.
G.I. Joe Crossovers
Generation 2
Autobot
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Decepticon
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Cybertronian
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Cybertron Alliance
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Beast Era
Beast Wars
Maximal Peacekeeper
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These symbols appeared on the walls of a transwarp shunt room used by Magmatron in IDW's Beast Wars: The Gathering. Although never explicitly stated, they apparently denote the original Predacon combiner team.
Beast Wars II
Beast Wars Neo
Beast Machines
Dinobot
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Car Robots

Takara used this symbol to represent the Combatron (Decepticon in Robots in Disguise) sub-group in Car Robots—it's an upside-down Generation 2 Autobot symbol, which had been molded into the Black Convoy toy, a redeco of Generation 2 Laser Optimus Prime. The Hasbro version removed them and used the traditional Decepticon symbol. Though it can be briefly seen several times in the cartoon, this symbol does not "exist" in the English version.
Unicron Trilogy
Armada
Mini-Con
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Unicron
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Energon
Energon
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Powerlinx - Gold
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Powerlinx - Silver
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Powerlinx - Red
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Team Ironhide
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Unicron
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Earth Federation
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Cybertron
Earth
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Velocitron
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Jungle Planet
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Gigantion
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Cybertron Defense Team
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2007 movie
For the 2007 movie, the Autobot and Decepticon factions were rendered in the steely gray seen below. Additionally- the Autobot and Decepticons were strongly associated with the colors blue and red, which led to the Autobot symbol appearing in blue in multiple media. Nonetheless the 'official colors' of said symbols remains red and purple.
Autobot
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Decepticon
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Sector Seven
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Mountain Dew Robot
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Stop Sector Seven
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Lunchables Brigade
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Shattered Glass
The alternate reality of the Shattered Glass timeline posits an army of evil Cybertronians united under the leering visage of a purple insignia badge... though probably not the one you were expecting.
Autobot Secret Police
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Transformers Animated
Cybertron Elite Guard
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Sumdac Systems
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Others
Unused concepts
Cobra/Decepticon
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