Letterman on a subtram map.
Letterman represented a location within the Coruscant Underworld, accessible via the subtram system. It appeared on the route maps displayed inside the subtram trains. Other stops listed alongside it included Sunset, Valley Village, North Hollywood, Beverly Blvd, Burbank, Lucasville, LAAC, Filoniville, Laurel Canyon, Coach House, Skinwalker, RGC, Skywalker Ranch, Big Rock Ranch and Skinwalker Ranch.
The inclusion of Letterman on the subtram map was a deliberate inside joke made by the production team of Star Wars: The Clone Wars. This, along with the other destinations featured, was a reference to the famous late-night television host, David Letterman.