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General Systems Vehicles GSV Mobile habitats and / or factory ships, largest Culture ship type. May be home to billions of people.
Medium Systems Vehicle MSV Smaller versions of the above. Sometimes former GSVs downgraded as larger GSV classes were developed.
Limited Systems Vehicle LSV Smaller versions of the above. Sometimes former GSVs or MSVs downgraded as larger GSV classes were developed.
General Contact Vehicle GCV Larger, more capable Contact craft between the size of a GCU and Systems Vehicle; plays similar role to GCUs (see below)
General Contact Unit GCU Ambassadors, scouts and light transports; also main warship in peacetime
Limited Contact Unit LCU Smaller versions of the above.
General Offensive Unit GOU Dedicated main warships
Rapid Offensive Unit ROU Dedicated fast warships
Limited Offensive Unit LOU Dedicated warships, smaller than GOUs