Definition
A finite non-empty set of symbols (called letters), is called an alphabet. It is denoted by Σ ( Greek letter sigma).
Example
Σ = {a,b}
Σ = {0,1} (important as this is the language which the computer understands.)
Σ = {i,j,k}
Note Certain version of language ALGOL has 113 letters.
Σ (alphabet) includes letters, digits and a variety of operators including sequential operators such as GOTO and IF
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