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An abbreviation of the year 2010. It follows a pattern that started in 2000 by abbreviating the year 2K, then 2K1, all the way until 2K9. In order to keep the term 3 characters long, though, X, the roman numeral for 10, is used instead of the actual number. 2KX, aside from the X, has NOTHING to do with Roman numerals. Writing 2010 in Roman numerals would give you MMX.
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