Presumably this is in reference to upper case Roman numerals rather than lower case numerals.
For example: MMVIII (upper case) and mmviii (lower case) but they both have the same numerical value of 2008.
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12500 = (XII)D which means 1000*12+500 Roman numerals are normally in block capital letters.
CMLI = 951 so the word 'climb' for example contains all these letters
I type them out as capital letters by clicking on the "Caps Lock" button. For example, like CC=200 (in Roman numerals).
Roman numerals are letters because i said so
Letters are not numbers. Not all letters in the alphabet represent Roman numerals though some letters do.