Polyfragmented plurality is a type of plurality under the subset of DID and OSDD, in which systems often have 100 or more systemmates.
Definitions vary, but the core component of polyfragmented plurality is the idea that rather than being made of a few headmates, systems are made of a large number of fragments. It is not uncommon for there to be over 100 or even over 1000 fragments, leading to many to define polyfragmented plurality as having over 100 headmates. These fragments can combine together into more fully formed headmates, often leading to subsystems of fragments. As a result, the existence of subsystems, or even subsystems within subsystems, is sometimes used as part of the definition of polyfragmented plurality.