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The top line of a fraction is called the "numerator". This serves to "numerate" the number of objects that you are finding a fraction of. For example, in the fraction 3/4, you are finding three quarters of something else.
It is simply called its top.
The top number is called the numerator.
What do you mean by "top of the graph"? Do you mean the highest value? The top of the graph is called "the top of the graph" There's no term for it.
The top number in an improper fraction is called the numerator. The bottom number is called the denominator.