Subsystem: A system within a system, or a headmate with their own headmates. Sometimes also refers to groups of headmates that are grouped together in other ways
The colors are taken directly from its companion flag, the polyfragmented one. The pink part is greyed out to represent a system with subsystems that may also not have layers
A 5 striped flag, with all the stripes vertical. The leftmost and rightmost stripes are blue, with the large center stripe being a dull pink. Between them are thin white stripes (or transparency, for the transparent version)