Question

what is " ( ) " called?

Answer 1

The symbols, you mean? Those are called "parentheses".

Answer 2

() Are called parenthesis, and they are used to contain a part of a sentance or to seperate terms in math.

Examples:

I didn't want to explain (it was a long story).

2+3(2+1)

If the use is in math, you always do what is inside the parenthesis first.

For example:

2 * 2 + 2 + 1

4+2+1

6+1

7 is the answer when no parenthesis are added.

2 * (2 + 2) + 1

2 * 4 + 1

8 + 1

9 is the answer when parenthesis are added, because you do the operations inside of parenthesis first.

Hope this was helpful!