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OSX was used originally to just describe version 10, a big change to the OS which broke backwards compatibility. Now its used loosely to describe any version above 9.

Each point version of OSX has a codename, Yosemite is v10.10. The latest version 10.14.x has the name Mojave.

Apple recently rebranded OSX to macOS, possibly to have a version number higher than 10 some day.

https://en.wikipedia.org/wiki/MacOS#Mac_OS_X

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> Apple recently rebranded OSX to macOS, possibly to have a version number higher than 10 some day.

that may be, I figured it had more to be in line with tvOS, watchOS, and iOS. having somethingOS for everything except for one being OSsomething just seemed oddball enough for them to want to bring it in line.

In theory you could have 10.1234567890 for a release and retain OSX if that was the concern. I think everyone would hate them for it, but I don't think there's anything preventing it.

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