Transform.up

var up : Vector3

Description

The green axis of the transform in world space.

JavaScript
    // Set's the rigidbody velocity to be 
// along the green axis of the transform
rigidbody.velocity = transform.up * 10;

using UnityEngine;
using System.Collections;

public class example : MonoBehaviour {
void Example() {
rigidbody.velocity = transform.up * 10;
}
}

import UnityEngine
import System.Collections

class example(MonoBehaviour):

def Example():
rigidbody.velocity = (transform.up * 10)