Am I the only one increasingly frustrated with macOS's naming scheme? I have no idea what the latest version is. Ubuntu versioning gets this right; you can parse their codenames alphabetically to derive the semantic version. But Apple's heuristic here seems to be "throw a dart at a map of California".
Mac OS X 10.7 "Lion" – 2010
Mac OS X 10.8 "Mountain Lion" – 2012
Now it is only a name I guess only people in US / California will know or understand. The same joke From Apple's "crack marketing team" and played out by Craig Federighi for something like 10 years[1].
But I guess that is post Steve Jobs's Apple for you.
[1] Just guessing since I remember they started using this line after Forstall left.