Y'tem

Y'tem was a star system in the Beta Quadrant.

In 2257, the system's location was labeled on the star chart showing the trajectory of Lieutenant Spock's shuttle. (DIS: "An Obol for Charon")

In 2259, the system's location was labeled on a stellar cartography chart seen on the USS Enterprise's ready room viewscreen. The system's symbol was a red Klingon Empire logo, indicating its affiliation with the empire. (SNW: "Children of the Comet")

This location was only mentioned in writing.
The name of this system came from the source material used, the Star Trek: Star Charts and Stellar Cartography: The Starfleet Reference Library, to create the star charts seen in both Star Trek: Picard and Star Trek: Strange New Worlds. According to the Stellar Cartography: The Starfleet Reference Library ("Stellar Cartography", pp. 30; "Federation Historical Highlights, 2161-2385"), the primary of the Y'tem system was an M-class star.