A large and often apparently random aggregation of orbital, asteroidal, or lagrange habitats, manufacturing plants, aioid structures, etc. Dyson swarms of solar power collectors are often found near stars, sometimes including large numbers of habitats as well.
Informal habitat swarms are common in many of the high population solar systems, and can easily include populations of several billions. Often, but not always, living conditions are substandard. The orbital equivalent of a "Sprawl".
Sprawl - Text by M. Alan Kazlev When planetary cities grow in an unsystematic and unplanned manner beyond normal boundaries, due to increases in population and industry, so that their suburbs merge into the suburbs of neighbouring cities, the result is a vast extended metropolis called a Sprawl. Sprawls are common on many of the less regulated high population older terraformed planets, and even on moons and planets without a breathable atmosphere or life-supporting environment, such as Luna and Titan in the Sol System. Often, but not always, living conditions are substandard. The planetside equivalent of a "swarm".