arabic
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9
9
The Hindu-Arabic numeral system which replaced the Roman numeral system.
A denary number is a number based on the ten digits, from 0 to 9. This is in contrast to the binary system used in computing, which consists entirely of 0s and 1s.
Zero is the only number that's its own opposite. While 0 is technically not signed (it's neither positive nor negative), it meets the definition for being its own opposite because 0 + 0 = 0.