content: Most software companies use code names for their releases, which as a rule of thumb ascend alphabetically and follow a theme. For example in Android: IceCreamSandwhich, JellyBean, KitKat, LolliPop, Marshmellow In the case of Apple's OSX; I believe it to be Mountains: https://en.wikipedia.org/wiki/El_Capitan EDIT: it's places in California