the back thing of a car is a boot or often know as trunk. Also on top of the trunk is a thing called a spoiler
The thing on the back of books is call ed a gurgle.
Assuming you mean back and forth from sideline to sideline or baseline to baseline, that would be called a suicide.
It is called a key
That doesn't really make sense. If you figure out the square root of the number, the whole point is to find a number which, when squared, gives you back the original number. Therefore, there is no such thing as a "square root that can't be squared".
Oklahoma A&M, now called Oklahoma State.
square up, find an open area , focus, and aim for the backboard or the back of the rim
The skin on the back of one's elbow is called olecranal skin, or colloquially, a weenis.