Exactly. And I have to point out to people all the time that it is, in fact, Apple MacOS 10 (ten) not "ecks". It is so stupid and redundant when I hear/see something like "OS X version 10.3"... it is not "Operating system version 10 version 10.3" it is really just MacOS 10.3.
Apple has marketed their stupid version number into something they can not and will never change now. There will probably never be a "MacOS XI" and "MacOS X version 11" makes no sense.