It doesn't have a formal name. However, since a fraction is division, you can call it a quotient.
I can't seem to find the measure because it always when trying to find x (verticla angle) turns into a decimal answer. So I'm hoping that the diagram could help you find your answer.
The slope is 9/11 because if you use the formula (change in y)/(change in x), you would get -18/-22 and then if it were to be simplified, it would be 9/11