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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 ();
using UnityEngine;
class Test : System.Object
	public int p = 5;
	public Color c = Color.white;