Roman numeral system.
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The Roman numeral system
N (or nulla) is a very rare way to write a zero. The standard Roman numbering system does not include a zero or null value. Even if it did, the structure you are proposing is incorrect.
The Roman Numeral system did not have a way to represent zero.
To write 150 crore in numerical form, you would write it as "150,00,00,000" in the Indian numbering system. In this system, commas are placed after every two digits starting from the right. Each comma denotes a place value of two decimal places, similar to how commas are used in the Western numbering system to separate thousands, millions, etc.
The symbol for zero because the Roman numeral system is quite capable of carrying out arithmetical operations without the need for a zero figure unlike the Hindu-Arabic numeral system where a zero symbol is essential to carry out calculations.