Tandemplex

Tandemplex:

A Tandemplex is a system with no 'main' subsystem or sidesystem. A Tandemplex instead has two or more sub/sidesystems that feel roughly equal to eachother in population, rank, headspace size, etc. Like the wheels on a tandem bike!

A Tandemplex can have smaller sidesystems or subsystems, the only prerequisite for using this label is that they don't have a single main subsystem or sidesystem, and instead have more than one.