A Son'a Ship is a ship that can be found on the Test of Time version of Civilization II. In this version the Son'a are not an independent country and are instead part of a coalition of all other aliens besides the big 3 powers, Federation, Klingon, Romulan which control a huge fraction of all of the wonders.

Son'a Ship (Civ2)

This is a Screen shot of a Son'a Ship from the Test of Time version.