Apple hints at OS X rebrand in the App Store
 

If you think about it, OS X isn't really a great name for Apple's Mac operating system. It was just meant to be the next OS after Mac OS 9, but because it has a nice round (roman) number and used all-new UNIX-based tech, Apple has stuck with the name...

https://www.engadget.com/2016/06/09/...the-app-store/