Class 9 cargo vessel

From Memory Alpha, the free Star Trek reference.

A class 9 cargo vessel was a Starfleet designation for a type of interplanetary sublight freighter utilized during the 24th century. These type of vessels had minimal weaponry, including lasers, and were typically slower than class 7 vessels.

In 2365, the USS Enterprise-D encountered a damaged class-9 cargo carrier, called the Erstwhile, while traversing the Omega Sagitta system. (TNG: "The Outrageous Okona")

For more information on this studio model, see studio models (TNG).