characteristic

tunnusomainen, luonteenomainen

ominaisuus

tuntomerkki Being a distinguishing feature of a person or thing.
(quote-book)|chapter=12
a distinguishing feature of a person or thing
puhekieltä the integer part of a logarithm
puhekieltä the distinguishing features of a navigational light on a lighthouse etc by which it can be identified (colour, pattern of flashes etc)
puhekieltä The minimum number of times that the unit of a field must be added unto itself in order to yield that field's zero, or, if that minimum natural number does not exist, then (the integer) zero.

A field's characteristic, if non-zero, must be a prime number.