iOS, watchOS, tvOS, and OS X. One of these things is not like the other. How long until we get macOS?
Reminds me of this exchange between John Gruber and Phil Schiller 3 months ago:
Gruber: Alright. What I think [I had] next was Apple Watch. [pauses] watchOS, with a lower-case "w". Are you trying to kill me?
Schiller: [laughs] It's, um... I think it works really well. I think it's nice, it's ownable, it's special...
I think, you'll see. Give us time, we've been through many fun naming things. This is an easy one. There have been many fun naming things through the years—some very emotional, some very easy—and most of the time, when all's said and done, you look back years later, people say 'Yeah, you guys were right, it all made sense together.'