When they form Project D what does the D stands for? On Initial D at around third to fourth stage, they finally form the group Project D (or get the left members into it) and somewhere along it Ryosuke mentions that "D" also stands for something else that he would reveal when the project is completed.

What does the "D" stand for?

I know it's not "Drifting" (or so I think, since they name it a lot of times with different meaning along the episodes, but I haven't watched it all yet) so I was thinking on something along the lines of "Driver" but wouldn't make much sense I guess.
I haven't watched the anime, but I read the manga. What 'D' stands for has not been explained explicity, but in the last chapter, Ryosuke Takahashi mentions three words that start with the letter 'D' when he prays to his girl friend. (mouse over to see the spoiler):


   dream, driver, diamond (in the rough).