The Berussian Cluster was an inhabited star cluster.

The con artist pretending to be Ardra claimed that she was known as Mendora in the Berussian Cluster, the inhabitant's equivalent to the Devil. (TNG: "Devil's Due")

This cluster was only mentioned in dialogue.
According to the script, the pronunciation for Berussian is "behr-RUH-seean". [1]
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