Why all OS X verions are 10? I was looking at the versions section of Wikipedia's article for OS X and I realized that all versions are prefixed with 10. Why? What is the logic behind prefixing al versions with a number that never changes?

Does it have to do something with the X in OS X? Why is it OS X? Is there some kind of fanaticism over the number 10 at Apple?
OS X is supposed to be pronounced "Oh Ess Ten" though no-one outside Apple ever seems to, common parlance would be "oss ex".

Though OS XI would, I guess, be OS eleven, how many people are going to end up calling it "oss exie" or "oss ex eye"?

The actual answer to the question "Why?" is presumably because Steve Jobs decided it would be; &amp; that would brook no argument.