Q:

How do I get list of all types in Maya's ls command?

In Maya there is a ls command which lists all objects in a scene (or DAG). 
pm.ls()

Here is reference to ls command.
We can list specific type of element by passing type parameter. 
pm.ls(type="joint")

Some possible types are, camera, mesh, joint etc.
My question is what are all types available to ls() command? Documentation doesn't help much. Where do I find it?

A:

Here is the flag to query node types :
cmds.ls(nt=True)

