As a human, you're unlikely to get a codename unless you're an important person with a security detail, but products get them all the time. Sometimes these end up being the real name by the time consumers buy it, like what Apple's done with its Mac operating systems. But more often they're used to keep things under wraps until everything's ready for the public. We've rounded up some you might know, and many others you probably don't. Test your knowledge below.