l-1
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lV-4
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lX-10
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This question was asked and answered yesterday under: "1-1000 in roman numerals?"
Letters are not numbers. Not all letters in the alphabet represent Roman numerals though some letters do.
As all United States issued paper currency contains Roman numerals, and such currency is traded worldwide, it is safe to say that nearly all countries use Roman numerals. However, there are no countries or cultures alive today which use Roman numerals for counting or math on a day-to-day basis.
Xviii.x.lxxxxi. All in capital letters.
Necessity is the mother of all inventions and Roman numerals were needed in the past just for the same reasons that we still need numbers today.