A power, most likely, though it could be a superscript.
A power, in its simplest form is the number of times the "main number" is to be multiplied to itself.
For example, 34 = 3*3*3*3 = 81
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If you add one to this number, you get the next whole number.
The number above is a rational number.
The number above the line.
A suite or apartment number would be placed on the line below the primary street address. According to FRANK'S COMPULSIVE GUIDE TO POSTAL ADDRESSES: In cases where the street name and number might be too long (e.g. for a database field, or for an automatic reader), any part of this line that denotes a sub-part of the main address (e.g. an apartment or suite number) can or should be put on a separate line above the street name and number.
it is a NumeratorBY:Emily