Yes the ra does stand for that. Although the ra is a lightweight model, so is the type r which I owned (the one I'd like to buy back) the type ra and type r are essentially the same spec give or take. The type ra is a for door version and has manual windows and no central locking, and the type r is a 2 door coupe version (same as the 22b and P1) but has electric windows and central locking. Both of them have the driver control center diff (dccd), intercooler spray, and a mad short ratio gearbox. The type ra weighs 1160kgs and the type r weighs in at 20kgs extra.
I have quite a few photos of my old scooby which I will post up in another thread in the gallery section when I get a chance.