Join Mark, Jon and Danny as they clear the T section of the Hitchhiker’s Guide to the Galaxy.

Tri-D is Adams’ allusion to some sort of 3D TV, and is distinct from Five-D, the sub-etha, the Sense-o-Tape, the Hall of Informational Illusions and whatever other technology he created to show things to characters.

The Triganic Pu is a form of galactic currency. Its exchange rate of eight Ningis to one Pu is simple enough, but since a Ningi is a triangular rubber coin six thousand eight hundred miles across each side, no one has ever collected enough to own one Pu. Ningis are not negotiable currency because the Galactibanks refuse to deal in fiddling small change.

Trillian is a beautiful astrophysicist, with the real name Tricia McMillan. She’s played by Susan Sheridan in the radio series, and by Zooey Deschanel in the film. She manages to convince the masters of Krikkit not to destroy the universe, and she learned how to maneuver around Hyde Park Corner on a moped.

On an Earth that was never destroyed by the Vogons, Tricia McMillan attempts to get a job with the NBS network in New York, as an anchor on the US/AM breakfast show. She regrets going back for her bag when first meeting Zaphod at that famous party in Islington. She failed the screen test for the network because she decided not to go back for her bag, thus not bringing her contact lenses which she needed to read the script and autocue. When taken to the planet Rupert by the Grebulons, she films the encounter and figures she must have faked it as part of an elabourate nervous breakdown or halicination.

“Have some sense of proportion” Trin Tragula’s wife would often say, so he built the Total Perspective Vortex, just to show her. And in one end he plugged the whole of reality, as extrapolated from a fairy cake, and in the other end he plugged his wife, where the shock annihilated her brain.

Turlingdrome. It’s a swear word. We don’t have a definition but it appears to be a derogatory term for a person, possibly a stupid person.

There’s a creative design firm in Cincinnati who’ve chosen Turlingdrome as their name, which sounds like it might be a bit like calling your company Shithead.