Every version of Apple's consumer desktop OS has been promoted by the large iconic "X." This is true when it was known as "MacOS X." It continues now that the OS is known simply as "OS X." The "X" invokes any number of meanings. I did not get into the meaning of the "X" or its pronunciation. Whatever its meaning or pronunciation, it is the visual brand of the operating system--beautiful and iconic in its symmetry.
11/25/15 at 6:28am