how to get empty size in script?

In unity3D, I create a empty to contains some 3d objects,now I want to get it size in C# scripts,how to code it ?

e.g. this pic , i want to get 14 in my script
.
107630-problem1.jpg

I think I can define a empty object and get it size…?But how to define a empty?Beginner for this…

I guess you want the number of children of your empty called Pickups

// Drag & drop the gameobject called `Pick ups` in the inspector
public Transform PickupsTransform;

void Start()
{
    Debug.Log( PickupsTransform.childCount ) ;
}

I guess you want the number of children of your empty called Pickups

// Drag & drop the gameobject called `Pick ups` in the inspector
public Transform PickupsTransform;

void Start()
{
    Debug.Log( PickupsTransform.childCount ) ;
}