There is no smallest number, since half that number would be smaller.
The Greek letter, delta, in lower case is one symbol is used for small numbers. Epsilon and eta are also used for small numbers in calculus.
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The smallest value Roman numeral using each symbol only once would be MCDXLIV = 1444
the smallest perfect number is 1
no 0 isn't the smallest number because there are negative numbers so there really is no biggest number nor smallest number
1 is the Natural number which is the smallest Odd number.
The symbol for number is #