Indicates the amount of digits to use for the numbers in a duplicated GameoObject's name.
By default, Unity adds successive numbers to a duplicated GameObject's name. gameObjectNamingDigits sets the minimum amount of digits in the numbers.
For example, setting EditorSettings.gameObjectNamingDigits to 3 results in instances of "Prefab" being named "Prefab (001)", "Prefab (002)" and so on.
Additional resources: NamingScheme, gameObjectNamingScheme, assetNamingUsesSpace.