Tracken II was the inhabited second planet in its system. This system, which was located in the Demilitarized Zone, was close to Solosos III. In the 2370s, it was the site of a Maquis colony.
In 2373, Captain Benjamin Sisko threatened to render the planet uninhabitable to Humans using trilithium resin unless Michael Eddington surrendered himself and his stocks of cobalt diselenide. Eddington agreed, and the planet was spared. (DS9: "For the Uniform")
According to the script, the pronunciation for Tracken was "TRAK-un".