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It wasn't the Romans that chose X to represent 10 but the Etruscans who invented this system of numeracy. Possibly it stems from the fact that if V is 5 then X is the equivalent of two V's joined together which equals 10.
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It's a trick question. It doesn't stand for anything.
They didn't because it was the Etruscans that did and presumably it meant a double V (5) which is X (10). The Roman numeral system originated from the Etruscan numeral system and the Etruscans once ruled the Romans.
5