I am looking at some US statistics and I have found this abbreviation, with this explanation (pdf) in the subtext.
NSPF - Not specifically provided for.
The context is a list of US trading codes.
0304991012 GROUNDFISH COD NSPF MEAT FROZEN > 6.8KG
I could not find a better description on the internet, so I am asking you what meaning you give "not specifically provided for".