The layer the game object is in. A layer is in the range [0...31]
Layers can be used for selective rendering from cameras or ignoring raycasts.
// Put the game object in the ignore raycast layergameObject.layer = 2;
using UnityEngine;using System.Collections;public class example : MonoBehaviour { void Example() { gameObject.layer = 2; }}
import UnityEngineimport System.Collectionsclass example(MonoBehaviour): def Example(): gameObject.layer = 2