Assembly: System.Management.Automation (in System.Management.Automation.dll)
A note property is a property that has a name/value pairing, such as a variable property. For more information about note properties in addition to other property types defined by the extended type system (ETS), see ETS Properties. For more information about the extended type system (ETS), see Windows PowerShell Extended Type System (ETS).
Although it is possible to derive from this class, there is no established scenario for doing this and any attempt to do so might result in unexpected behavior.