10 (DIM-8)
From Star Trek : Freedom's Wiki
Planet 10 (DIM-8) is a planet located in or near Federation space.
Upon its launch from Earth in 2137, Planet 10 (DIM 8) was the destination of the SS Buckaroo Banzai. (TNG: "Up The Long Ladder")
Background[edit]
The name of this planet appeared on an okudagram that appeared on Jean-Luc Picard's desk monitor, and was not verbally referenced on screen. A legible version of the okudagram appeared in the reference book, Star Trek: The Next Generation - The Continuing Mission.
"Planet 10" was an in-joke reference to the film The Adventures of Buckaroo Banzai Across the Eighth Dimension!, with "DIM-8" being an abbreviation for the "8th Dimension."