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

Autobot

Decepticon

Generation 2

Autobot (G2)

Decepticon (G2)

Beast EraMaximal

Predacon

Blendtron

Maximal (BM)

Vehicon

Dinobot

Mutant