Here is a list of all namespaces with brief descriptions:

[detail level 1234]

▼Nad
▼Nrss
Nstate
Nworld
▼Nbuiltin_interfaces
Nmsg
▼Ncarla	This file contains definitions of common data structures used in traffic manager
▼Nclient
Ndetail
Ndetail
▼Ngeom
Ndeformation
▼Nimage
Ndetail
▼Nio
Ndetail
Niterator
Nlearning
Nlogging
Nmultigpu
Nnav
▼Nopendrive
Nparser
Npointcloud
▼Nprofiler
Ndetail
▼Nroad
Nelement
Nobject
Nros2
▼Nrpc
Ndetail
Nrss
▼Nsensor
▼Ndata
Ndetail
Ndetail
Ns11n
▼Nstreaming
▼Ndetail
Ntcp
Nlow_level
▼Ntraffic_manager
▼Nconstants
NCollision
NFrameMemory
NHybridMode
NLaneChange
NMap
NMotionPlan
NNetworking
NPathBufferUpdate
NPID
NSpeedThreshold
NTrackTraffic
NTrafficLight
NVehicleLight
NVehicleRemoval
NWaypointSelection
NPID
▼Ncarla_msgs
Nmsg
Nclmdep_msgpack
NCommonAttributes
Ndvs
▼Neprosima
Nfastcdr
▼Ngeometry_msgs
▼Nmsg
Ndetail
NImageUtil
NMapGen
NMeshReconstruction
▼Nmoodycamel
Ndetails
▼Nnav_msgs
Nmsg
Nphysx
NPropAttributes
Npugi
▼Nrosgraph
Nmsg
NSceneCaptureSensor_local_ns
▼Nsensor_msgs
▼Nmsg
Ndetail
NSimplify
Nstd
▼Nstd_msgs
▼Nmsg
Ndetail
▼Ntf2_msgs
Nmsg
NUOpenDriveMap_Private
▼Nutil
Nbuffer