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The number above the line in a fraction is called the numerator. The number below the line is called the denominator. So in the fraction 5/7 5 is the numerator and 7 is the denominator.
The vinculum is placed on top of the repeating number after the decimal. For example, 1/3 would be written out as .333333 or .3 with the vinculum above the three.
If the threes go on indefinitely, then it is a repeating decimal, represented by a line over the repeated number, also .333...(going on forever) is equivalent to 1/3
It is -1.2... (repeating).
The line above the number means in Math Terms that the number is repeditive and goes on and never stops.