How many unique numbers do we use in Base 5

- - In base-10 (decimal), there are 10 unique symbols ... the digits from 0 to 9.

- - In base-2 (binary), there are 2 unique symbols ... 0 and 1.

- - In base-5, you need 5 unique symbols. You could use the digits 0 to 4,

or you could use other symbols, like %, #, @, +, and Δ. Whatever you like,

but you need five of them ...