Fabrina was a Class M planet located in the Scorpius-Centaurus OB Association area of the galaxy. The planet orbited a red giant star known as Ganidra, and was home to a humanoid species known as the Fabrini.
The planet was destroyed when the star went supernova. Prior to this, the Fabrini people built and launched the world-ship Yonada, which over the next 10,000 years carried the remainder of the Fabrini people to a new world known as Lorina. (TOS episode: "For the World is Hollow and I Have Touched the Sky"; TOS novel: Ex Machina)