Borg scout ship

Star Trek: The Next Generation
Episode: TNG 223 - I, Borg

A much smaller vessel than its larger Borg cube ship, this cubical vessel is only 2.5 million metric tons in mass, and holds a small crew of five.

On stardate 45854.2, such a vessel was discovered by the crew of the Galaxy-class U.S.S. Enterprise on a remote moon in the Argolis cluster.