Question

What does Epsilon mean?

Answer 1

Hint: We know that the above word Epsilon is denoted by the symbol $\in$ . It is just not like any other mathematical variables like $x,n$ or $k$ . The word Epsilon is a Greek letter and it stands for an arbitrary number and we use it in algebraic inequalities. We use it to denote a small quantity like a term which is taken to zero in some limit .

Complete answer:
As we can see that the symbol of Epsilon is “ε”, we should be careful that this symbol of Epsilon should not be confused with the Set symbol. We know that in set theory we used to symbolize the belongs to with $\in$ which states that a subset belongs to which set, as for example: $1\in \{1,2,3\}$ .
Here it means that the number $1$ belongs to the set $\{1,2,3\}$ .

Note: We should note that in set theory if there is $x\in X$ , then $X$ is a set and $x$ is a member of the set. But we should be careful that it is not the Epsilon symbol. There are also various symbols which are used to write the epsilon delta function. Epsilon has no inherent meaning of its own like as of other mathematical symbol like
 $pi(\pi )$ or Euclid number $(e)$ .