What the localEulerAngles relative to if the parent is null ?

Hi there, I’m new in Unity. I had checked the Script Reference about the Transform.localEulerAngles, and it says “The rotation as Euler angles in degrees relative to the parent transform’s rotation.” But, My question is , if the parent is null, what does the localEulerAngles relative to ?

It would be relative to the world which will be the same value as Transform.eulerAngles