Question

∈
What does this symbol mean ????

Answer 1

element.

Like 1 is an element of the integers

Answer 2

'belongs to' I presume

Answer 3

\[
x\in A
\]Means \(x\) is an element in the set \(A\)

Answer 4

\[
4\in \mathbb{N}
\]Means \(4\) is in the set \(\mathbb{N}\).
Since \(\mathbb{N}\) is the set of natural numbers, it basically means \(4\) is a natural number.

Answer 5

True story @wio