The Mayans were the only civilization to have a zero in their number system The zero was a shell.
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The Mayans had the number zero in their number system (their written symbol for it was a shell). The idea of zero was something that most ancient cultures didn't have in their number systems. Not even the Greeks and Romans had a concept of zero. Although, the Persians also had the number zero in their system of numbers as well. So the Mayans weren't the only ones.
The number zero does not have a significance in Roman numerals because the Romans did not have a symbol for zero. Roman numerals are based on a system of adding and subtracting values of different symbols to represent numbers.
The term "nulla" in Roman numerals represents the number zero. It is significant because the Romans did not have a symbol for zero, so they used the word "nulla" to indicate the absence of a value in their numerical system.
Mayans had an actual symbol to represent zero - the Mesopotamians just left a space in their cuneiform number representation to indicate a place without value, similar to the modern-day zero Mayans used a base 20 number system.
The number zero was credited to the mayans. Below is a table showing the Mayan numeric system.