Here is a list of all namespaces with brief descriptions:

Ncom
Nsun
Nstar
Nbeans
Ncontainer
Nlang
Nregistry
Nsecurity
Nuno
Ncppu
Ndetail
NEnvDcp
Nhelper
Npurpenv
Nosl
Nrtl
Nlibreoffice_internal
Nmath
Nsal
Nsalhelper