A typographic error.
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They represent 1888 in Arabic or English numbers
It is algebra that uses letters to represent numbers and also Roman numerals.
It is: 205 = CCV in Roman numerals
To write three million in Roman numerals, you would use the numeral "M" for a thousand, repeated three times to represent three thousand. Then, you would add the Roman numeral for a million, which is a bar over the numeral "M" (written as "M̅"). Therefore, three million in Roman numerals is written as MMMM̅.
XI represents 11 (eleven). The X = 10, and the I (I =1) being on the right is added to X making it 11.