In the Hindu-Arabic system of numeracy (the system we use today) it is needed to indicate positional place value of numbers i.e. 10 is ten but 100 is a hundred.
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The zero symbol as a Roman numeral is N but it was never needed
They contain a zero symbol whereas Roman numerals do not contain a zero symbol because it's not needed
It lacked a zero symbol which was not needed
It can't be represented by any symbol.Another Answer:-The symbol for zero as a Roman numeral is N but it is never needed because the positional place value of Roman numerals are self evident.
The number zero is needed in the Hindu-Arabic numeral system because as for example it tells us that there is a difference between 207 and 27 but in the Roman numeral system a zero number is not needed because we automatically know that there is a difference between CCVII and XXVII. In fact the Romans had a symbol for zero which was N and its Latin word is 'nihil'