All number systems use a figure for some kind to stand for a number.
The numerals 0,1,2,3,4,5,6,7,8,9 are the symbols for base 10, but base 2 uses only 0 and 1. Base 16 uses 0,1,2,3,4,5,6,7,8,9, A(for 10), B(for 11), C(for 12), D(for 13), E(for 14), and F(for 15) that makes 16 symbols to be considered as single digits for 16 numbers (0 thru 15). Each base must have that number of symbols for their individual numbers from 0 to one less than the base. Base 60 will need 60 such symbols, I've never seen them.
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It is the number 16.
Ten.
The number system that uses a base of 10 and the valid numbers are 0 to 9 is the decimal system.
The decimal system is based on the number ten.
base-10 number system