Serializable Manual     Reference     Scripting  
Scripting > Attributes > Serializable
Serializable Class, inherits from Attribute

The Serializable attribute lets you embed a class with sub properties in the inspector.

You can use this to display variables in the inspector similar to how a Vector3 shows up in the inspector. The name and a triangle to expand its properties. To do this you need create a class that derives from System.Object and give it the Serializable attribute. In JavaScript the Serializable attribute is implicit and not necessary.

class Test extends System.Object
var p = 5;
var c = Color.white;
var test = Test ();

// C# Example
class Test
public int p = 5;
public Color c = Color.white;