Thank you all for your answers, this last post helped a lot with my translating. Oh, by the way mine is going to be the first translation of the book (Guards! Guards!) in Farsi (Iran). I just started today and was wondering what was he referring to. I knew he had something to do with Schrodinger's Quantum Mechanics and his idea of L-Space had the same thing to do with Schrodinger's K-Space theory. But I just didn't quiet understand aforementioned gesture, but dear AgProv's comment cleared it all. Because in the text after he says, "too bad we never used Schrodinger's Paperback", he goes on saying, "This i's where the dragons went."
And now it makes perfect sense. Because later on in the novel the dragons suddenly reappear and disappear when called upon.
Anyway, thanks a lot AgProv, and noelu for making the topic so I could find this amazing site.