Nabisco's Oreos are so popular that the name itself is by now practically synonymous with sandwich cookies, to the point where many of you probably didn't even realize "sandwich cookies" was a term until you read it just now (we all just call them Oreos, like aspirin or thermos). Oreos are so ingrained in American culture that we even have special gadgets for dunking them in milk, but they're also eaten and enjoyed all over the world.