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It is technically not a valid Roman numeral.Proper Roman numerals proceed in descending order unless it's a "subtractive" numeral. Subtractive numerals are alwayspaired with a larger numeral. And if used as a subtractive numeral, the subtracting character should not appear elsewhere.

XXL is invalid because it violates at least two rules. Two X's (10) occur before the larger L (50), and a second X exists with the XL (40) subtractive pair.

The following arrangements are valid:

XL (50 - 10 = 40) is valid (XL is a subtractive pair)

MCM (1000 + (1000 - 100)) = 1900) is valid (1000 > 900, and CM is a subtractive pair).

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13y ago

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