2KX is made up of Arabic derived numberals, plus an initial (ie abreviation) of a Greek word.
Shame on UD for putting up this definition as word of the day, now we're probably gonna have people thinking the roman numerals are I, V, X, L, C, D, K.
2KX, aside from the X, has NOTHING to do with Roman numerals. Writing 2010 in Roman numerals would give you MMX.
Note the roman numeral for 1000 is M, so 2MX, MMX and KKX are equivalent.
"Welcome to this extravaganza to see in the new year, 2KX... yes 2010 is finally here after a whole years wait!"
person 1: Did you know that 2KX is the roman numeral for 2010.
person 2: Actually, that would be MMX. 2KX is a mixture of Roman and engineering notations.
person 1: So the definition of 2KX on UrbanDictionary was wrong?
person 2: Yes, whoever wrote that was a muppet...
Also 2 is a standard Arabic character, fcunt.