Which of the following is/are NOT real number(s)?

Question

0,-pie,5into under root,all of the above real numbers.

Answer 1

0 is a real number, and so is negative pi.

Any number than can be visualized as points on a infinitely long number line is a real number.

But what exactly is "5into under root"?

Answer 2

I know a pie is - a baked food having a filling of fruit, meat, pudding, etc., prepared in a pastry-lined pan or dish and often topped with a pastry crust: apple pie; meat pie.