Diviseur

07:05 Jul 4, 2017 

Thank you for your efforts. I asked client for help but reply was "please suggest something". So in order to deliver I used:
File/Subsection for Exposant/Diviseur.

08:01 Jun 23, 2017 

Ah, OK, thanks — that does seem to at least make it clearer that this is some kind of reference number that appears to be in 2 parts...

07:48 Jun 23, 2017 

I now have blank copy of the form which i`ll try to copy.
Not certain this tells us much more but here you are.

3.3.1.1.Parcelle n°
Référence de la parcelle :
INS (Commune) Commune
INS (Division) Division
Section Numéro Lettre Exposant / Diviseur

07:21 Jun 23, 2017 

I'm not so sure about 'superscript' here — remember that is only the typographical description of the result of what an 'exposant' is.

Do you have the figures that go with?

I suspect this is more to do with fractions; suppose, for example, this was a reference number in the format 12345/6789, which might be regarded as if it were a fraction, in which case '12345' would be the numerator ('exponent') and '6789' the denominator ('divisor') — in other words, the 'top' and 'bottom' parts of the fraction, or in my suggested scenario, the first and second parts of the reference no.