The Hitchhiker's Guide Project

Thumb, The

A short squat black rod, smooth and matte with a couple of flat switches and dials at one end. The Thumb is used by Hitchhikers throughout the Galaxy to flag down passing starships. Half the electronic engineers in the galaxy are constantly trying to find fresh ways of jamming the signals generated by the Thumb, while the other half are constantly trying to find fresh ways of jamming the jamming signals