Gamma Trianguli IV was the inhabited fourth planet of the Gamma Trianguli system. The system was located in the Gamma Trianguli sector. This was a non-Federation planet. Lieutenant Commander Wendy Neuss, a crewmember aboard the USS Enterprise-D, was from this planet.
In 2293, the location of Gamma Trianguli in the Milky Way Galaxy was labeled in a star chart that was in Captain James T. Kirk's quarters aboard the USS Enterprise-A. (Star Trek VI: The Undiscovered Country, okudagram)
In 2368, the location of Gamma Trianguli was labeled on the tachyon detection grid that was displayed on one of the viewscreens of the USS Enterprise-D. (TNG: "Redemption II", okudagram graphic remastered)