answer:The “Large” refers to the size. The A or AA is the grade and refers to the quality and appearance of the egg white and yolk From the USDA site: “U.S. Grade AA eggs have whites that are thick and firm; yolks that are high, round, and practically free from defects; and clean, unbroken shells. Grade AA and Grade A eggs are best for frying and poaching where appearance is important. U.S. Grade A eggs have characteristics of Grade AA eggs except that the whites are “reasonably” firm. This is the quality most often sold in stores.” I think I’ll have a couple of eggs for breakfast today.