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A
civilization where the
majority are not
inhabiting a
physical,
biological body, but exist solely as
intelligences/
information inside
computers (or their
analog for that civilization).
This name comes from the term "solid state", referring to the makeup of transistors and other components used in electronics today, as opposed to relays and other old technology.
Where those intelligences inhabiting the computers come from is not all that important. They may have come from sentient beings that have left a biological body and uploaded themselves into the computer. They may be artificial intelligences, either created out of whole cloth, or generated from a combination of other AIs. Perhaps they even consist of both, a former biological being that was able to transfer its' consciousness into the machine, where it was combined with a partial AI as an assistant to adjusting to the new way of living.