// Set's the rigidbody velocity to be 
// along the blue axis of the transform

rigidbody.velocity = transform.forward * 10;

using UnityEngine;
using System.Collections;

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

import UnityEngine
import System.Collections

class example(MonoBehaviour):

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

// Computes the angle between the target transform and this object
var angleBetween = 0.0;
var target : Transform;
function Update () {
    var targetDir = target.position - transform.position;
    angleBetween = Vector3.Angle (transform.forward, targetDir);
}

using UnityEngine;
using System.Collections;

public class example : MonoBehaviour {
    public float angleBetween = 0.0F;
    public Transform target;
    void Update() {
        Vector3 targetDir = target.position - transform.position;
        angleBetween = Vector3.Angle(transform.forward, targetDir);
    }
}

import UnityEngine
import System.Collections

class example(MonoBehaviour):

    public angleBetween as single = 0.0F

    public target as Transform

    def Update():
        targetDir as Vector3 = (target.position - transform.position)
        angleBetween = Vector3.Angle(transform.forward, targetDir)