Question

what the heck this symbol mean? ​

Answer 1

$\color{red}\huge\bold\star\underline\mathbf{ANSWER:}\star$

It is the representation of set of numbers.i.e 3,4

Answer 2

The meaning of this symbol is Element.

It is read as :-

3,4 are the elements of 'A'.

Hope it's helpful mate!!..