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Re:OS X Yosemite by frik on Monday June 02, 2014 @03:58PM (#7835875)
OS X (previously Mac OS X) is the successor of Mac OS 9. X stands for 10 in roman numerals: http://en.wikipedia.org/wiki/Roman_numerals

For marketing reasons (as some don't know about roman numerals), Apple writes it like this OS X 10.9 or now OS X 10.10 or OS X Yosemite (instead of Mac OS X.10 or Mac OS 10.10).

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