Jaguar XJ
Classic British luxury car. One appeared in the video for Vision's song 'Say Yes'. Noted for its lousy electrical systems.

"Jisan"
Nickname for Dr Raven. Literally, 'old man'.

JTK
Manufacturer of flatscreen TVs.

J-1
Artificial intelligence system fitted in the DD battlemover that allows it to continue fighting even if the operator is killed or injured. If the battlemover's power runs out while the J-1 is active, the system automatically detonates a micro-neutron bomb - the ultimate no-win situation.