The normal of the surface we collided with in world space.

	// print the point's normal we impacted
	function OnControllerColliderHit(hit : ControllerColliderHit) {
		Debug.Log("Normal vector we collided at: " + hit.normal);
	}

using UnityEngine;
using System.Collections;

public class Example : MonoBehaviour {
    void OnControllerColliderHit(ControllerColliderHit hit) {
        Debug.Log("Normal vector we collided at: " + hit.normal);
    }
}

import UnityEngine
import System.Collections

public class Example(MonoBehaviour):

	def OnControllerColliderHit(hit as ControllerColliderHit) as void:
		Debug.Log(('Normal vector we collided at: ' + hit.normal))

Note: When the CharacterController is colliding with an edge or a corner rather than a flat surface, the reported normal may be different when colliding with BoxColliders than when colliding with MeshColliders. This is due to a limitation in how PhysX handles Capsule/BoxCollider collisions.