Here is a list of all namespaces with brief descriptions:

[detail level 123]

Narm64_dwarf
Narm64_ehframe
Nclang
NCoreSimulatorSupport
Ndwarf
Nelf
Nembedded_interpreter
Nlldb
Nlldb_private	A class that represents a running process on the host machine
Nansi
Nbreakpad
NClangExpressionUtil
Nctf
Ncurses
Ndil
Nendian
NFormatEntity
NFormatterBytecode
Nformatters
NCallStackArray
NConstantArray
NFoundation1010
NFoundation1100
NFoundation1300
NFoundation1428
NFoundation1430
NFoundation1436
NFoundation1437
Ninstrumentation
Nline_editor
Nlua
Nlzma
Nmcp
Nminidump
NNETBSD	Core files PT_NOTE segment descriptor types
NAARCH64
NAMD64
NI386
Nnpdb
NOPENBSD
NOperandMatchers
Nplatform_aix
Nplatform_android
Nplatform_freebsd
Nplatform_gdb_server
Nplatform_linux
Nplatform_netbsd
Nplatform_openbsd
Nplugin
Ndwarf
Npostfix
Nprocess_aix
Nprocess_freebsd
Nprocess_gdb_remote
Nprocess_linux
Narm64
Nresource_handle
Nprocess_netbsd
Npython
Nsve
Ntelemetry
Ntrace_intel_pt
NParsingUtils
Nwasm
Nx86_64_with_base
Nlldb_protocol
Nmcp
Nllvm
Ncodeview
Njson
Npdb
Nsys
NWin64EH
Nloongarch_dwarf
Nppc64_dwarf
Nppc64le_dwarf
Nriscv_dwarf
Nsddarwinlog_private
Nx86