I think the full name is/was the PlayStation-X, but the X got dropped off somewhere along the line and only hangs around in the abbreviated PSX form. I'm not sure exactly where the "-X" stopped being used, but it might have been during the time when the system went from being the intended Super Nintendo CD-Rom add-on it was planned as to the stand-alone machine it eventually turned into.
I didn't watch this show on principle. I mean, could they have tried to shove this show down our throats any harder??! If this show fails, they won't be able to blame it on lack of promotion! (Too much promotion, on the other hand...)