What is the difference between an Alphabet and an element of a set. Whether Alphabet is an element of a set or it is a set itself?

An Alphabet is a set in itself. The elements of an Alphabet are called letters .
For example
Binary Alphabet Σ = {0,1}
Here 0,1 are the letters of binary alphabet.
Binary Alphabet is very important because it the Alphabet used by the computer.
Set of Natural Numbers
N={1,2,3,4,5,…………………………………..}
Here 1,2,3……………………………………. are the elements of set of Natural Numbers.