Yes and a nought figure is not needed to represent the positional place value of Roman numerals because their positional place values are self evident.
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Place value is not used in the Roman numeral system.
It is O because it's not needed in the Roman numeral system for place value purposes as the place value of the numerals are self evident
E is not used as a symbol in the roman numeral system.
There is no place value system in Roman numerals because they had no numeral for zero. We add a zero to change a 1 to a 10 and then add another 0 to change it to 100 and so on. The Roman system simply used different symbols to change from units to tens and so on. So... I = 1, X = 10, C = 100 and so on, without the need for a change of place or the use of a zero.
The Arabic numeral system is the one used in most countries of the world and it based on the numbers; 1, 2, 3, 4 ,5, 6, 7, 8, 9 and 0. The numbers have place values based on multiples of 10. The Roman numeral system does not have place value and the numerals used are; I, V, X, L, C, D and M.