Galactic Cluster 3
Galactic Cluster 3 was the Borg designation for a transmaterial energy plane intersecting 22 billion omnicordial lifeforms. 

The Borg encountered Species 259 in Galactic Cluster 3. They assimilated autonomous regeneration sequencers from this species, a technology later installed by the Borg aboard the  in 2374. ()

de:Galaktischer Cluster 3
it:Ammasso Galattico 3
ja:第3銀河星団

Clusters
Borg spatial designations