One for each axis of the alignment grid that DnD has mapped out.
Basically they have two axis for their alignment system, Lawful/Chaotic and Good/Evil.
Neutral in this system would be as close to 0,0 as possible. Lawful, Good numbers would be positive, and Chaotic,Evil would be negative. This would mean a Lawful good paladin might be 88,76 while a good hearted farmer might be 24,12. Both digits on a range from 100 to -100. Every action has a simple point value assigned by the Dm. So if you slaughter some innocents then you're good/evil axis might drop -20 points. Breaking the law would shift your Lawful/Chaotic axis down -10 points. Etc. This would make a more fluid alignment system but still adhere to all the spells and abilities laid out in D&D.
It also allows you to graph characters alignments on a chart, which is kind of cool. That was my original intention, but found that a fluid alignment system changed the dynamic of the game a little bit. Now every action was a lot more important for those characters that need to have an alignment to keep their powers. Good characters needed to focus more on being good and the ramifcations of their actions. Etc. Led to moral/Ethical debates about character actions.