Here is a list of all namespaces with brief descriptions:

[detail level 1234]

Nbatchlas
Nbackend
Ndetail
Ncoverage
Ncsr_generators	Random sparse test-matrix generators
Ndetail
Ndevice
Ndetail
Ngeneric
Nsubgroup
Ngeqrf_native
Ngetrf_native
Ninternal
Nlinalg
Ndetail
Nops
Ngemm
Ngemv
Ngeqrf
Ngesv
Ngesvd
Ngetrf
Ngetri
Ngetrs
Norgqr
Normqr
Ndetail
Nposv
Npotrf
Nspmm
Nsyev
Ndetail
Nsymm
Nsyr2k
Nsyrk
Ntrmm
Ntrsm
Nportable
Ndetail
Npotrf_native
Nselect
Ndetail
Ntesting
Nsycl_gemm
Nwide_scalar
Nwide_transposed
Nsycl_gemm_small
Nsycl_gemv
Nsycl_geqrf
Nsycl_gesvd
Nsycl_getrf
Nsycl_getri
Nsycl_getrs
Nsycl_orgqr
Nsycl_potrf
Nsycl_spmm
Nsycl_trsm
Ntuning
Ndetail
Nutil
Nverify
Ndetail
Nminiacc