Here is a list of all namespaces with brief descriptions:

[detail level 12345]

N__abi_details
N__winRT
N_com_util
Nchrono
▼Ncliext
Nimpl
▼NConcurrency	The `Concurrency` namespace provides classes and functions that provide access to the Concurrency Runtime, a concurrent programming framework for C++. For more information, see Concurrency Runtime.
▼Ndetails
Nplatform
Nstd
Ndirect3d
Nextensibility
Nfast_math	Functions in the fast_math namespace have lower accuracy, and support only single-precision float.
▼Ngraphics
Ndetails
Ndirect3d
Nprecise_math	Functions in the precise_math namespace have higher accuracy, but require double-precision support, which not all accelerators do.
▼NMicrosoft
▼NVisualC
NStlClr
▼Nmsclr
N_detail
Ncom
▼Ndelegate_map
Ninternal
▼Ninterop
Ndetails
▼Nmsl
▼Nutilities
Ndetails
▼NPlatform
NDetails
Nregex_constants
Nrel_ops
▼Nstdext
Nallocators
Ncvt
Nthreads
Nstdx
Nthis_thread
▼Ntr1
Nregex_constants
▼Ntr2
Nsys
▼NWindows
NFoundation
▼NUI
▼NXaml
▼NMedia
NAnimation
NMedia3D