The ordinary decimal system uses ten distinct single-symbols:
0, 1, 2, 3, 4, 5, 6, 7, 8, and 9. But many other ways of writing numbers
are available. Here are a few. All these cases show how the quantity
sixteen would be written.

Sixteen_{base} = How Sixteen is Written_{In case we have this many distinct symbols}

10_{16}

11_{15}

12_{14}

13_{13}

14_{12}

15_{11}

16_{10}

17_{9}

20_{8}

22_{7}

24_{6}

31_{5}

100_{4}

121_{3}

10000_{2}

When the number of distinct symbols is just two (2), they are usually
written 0 and 1. This is the binary means of
tracking quantity.