It is an area of ambiguity or multiple options.
Sometimes being vague can be better than being precise! haha
To add to that … there are multiple ways to play something written out / named the same way.
Here are two (of many possible) examples of a C triad 2nd inversion. the first is a closed triad (adjacent strings only, the types taught in PMT). The second is an open or spread triad where one of the notes sits within a different octave. These are not covered within PMT.