Unknown

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Unknown refers to a system whose origins are not known, or uncertain. This may be due to being recently discovered or not wishing to define oneself with specific labels.

Unknown is one of the four plural rings, and can be combined with other terms to describe mixed-origin systems.

Related Terms
Cryptogenic refers to a system whose origins are unknown.

Quoigenic may be used to mean one's origins are not relevant.

Congenic refers to a system with complicated origins.