Nav object contains multiple navigation nodes. Whenever you're dealing with a nav in your template, you have access to the following.
|ID for the nav.|
|The name of the nav.|
|The handle of the nav.|
|Any additional instructions for the nav, often for internal use in the control panel.|
|The maximum number of nested level of nodes a nav can allow.|
|The maximum number of nodes a nav can allow.|
|Whether the propagate (copy) nodes across all your sites.|
Available for Craft 3. Get it from the plugin store.