Theta III
From Memory Alpha, the free Star Trek reference
Theta III is a planet located in or near Federation space. (TNG: "Conspiracy")
Theta III was mentioned as a small note on a very large star chart graphic created for "Conspiracy". It was the image behind the chair in the room where Dexter Remmick was killed. It appears to be located within an outlined block, which may indicate that it was surrounded or was even a part of Federation territory at the time.
