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.

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.

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 in the cartoon, this symbol does not "exist" in the English version.''

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.

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.''