The number of the AssetProperty(s) in the object.
Namespace: Autodesk.Revit.DB.Visual
Assembly: RevitAPI (in RevitAPI.dll) Version: 19.0.0.0 (19.0.0.405)
Namespace: Autodesk.Revit.DB.Visual
Assembly: RevitAPI (in RevitAPI.dll) Version: 19.0.0.0 (19.0.0.405)