https://docs.unity3d.com/es/2018.1/ScriptReference/SerializedObject-targetObject.html
SerializedObject-targetObject - Unity Scripting API
The inspected object (Read Only).
unityscriptingapi
https://learn.microsoft.com/ru-ru/dotnet/api/system.windows.markup.iprovidevaluetarget.targetobject?view=netframework-4.8.1&viewFallbackFrom=windowsdesktop-10.0
IProvideValueTarget.TargetObject Property (System.Windows.Markup) | Microsoft Learn
Gets the target object being reported.
property systemwindowsmarkupmicrosoftlearn