The Borg use a system of species designations to identify various species and cultures they have encountered.

It is not explicitly stated how these designations are assigned, though it is generally assumed that they are simply incremental, each newly encountered species getting a number one higher than the previous. This mostly holds up when comparing numbers to probable first contact dates or vicinity to Borg space, though some anomalies exist, most notably the Alpha Quadrant species Ferengi having an unusual low number of 180. Numbers appear to be assigned at first contact, and don't seem to be recycled even after the whole species is assimilated.

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