transform.quaternion code example

Example: transform.rotation

transform.eulerAngles = new Vector3(0, 0, 180);
transform.localEulerAngles = new Vector3(0, 0, 180);
transform.eulerAngles = new Vector3(0, 0, 180);
transform.localRotation = Quaternion
transform.rotation = Quaternion.Euler(0, 0, 90);