The names "00 "and "0" flour refer to specifically Italian milled flour that is used for making pasta, bread, and pizza. The grading system is 2, 1, 0 or 00 and indicates to how finely ground the flour is and how much of the bran and germ have been removed. 2, for instance, is wholemeal flour while 00 is the most refined of the three and has the lowest level of bran. It is similar to unbleached all-purpose/plain flour, which is a mix of hard and soft wheat, and while finer, it creates a dough that is silkier and maintains a chewiness when the pasta is cooked. With that said, All-purpose flour is perfectly fine to use for making homemade pasta."