The decimal system is based on the ten digits 0, 1, 2, 3, 4, 5, 6, 7, 8 and 9. For systems whose bases are greater than 10, you need more "digits" and, since there are no more single digits, you use these 10 digits together with some alphabetic characters. So, for base 12, you use A and B; for base 16 you use A, B, C, D, E and F and so on.
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decimal system
The decimal system is the same anywhere. Dec means 10 so the decimal system is a system used on the base 10 system.
Dewey decimal system
All real numbers can be represented in the decimal system. Complex numbers can be represented by a pair of numbers in the decimal system.
"What are the classification under the dovey decimal classification system?"