T'lli Beta
From Memory Alpha, the free Star Trek reference
T'lli Beta is a planet in the T'lli Beta system, home to the T'lli Betans.
In 2367, the USS Enterprise-D was en route to T'lli Beta before it was ensnared by the gravitational pull of a cosmic string fragment which a group of two-dimensional lifeforms were attempting to enter. (TNG: "The Loss")
T'lli Beta also appeared in the starchart Data and Picard were studying in stellar cartography in 2371. (Star Trek Generations)
This planet was named after writer Hilary J. Bader's grandmother, Tillie Bader. (Star Trek Encyclopedia)
