Scripting Reference
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Transform.Rotate

function Rotate (eulerAngles : Vector3, relativeTo : Space = Space.Self) : void

Description

Applies a rotation of eulerAngles.z degrees around the z axis, eulerAngles.x degrees around the x axis, and eulerAngles.y degrees around the y axis (in that order).

If relativeTo is left out or set to Space.Self the rotation is applied around the transform's local axes. (The x, y and z axes shown when selecting the object inside the Scene View.) If relativeTo is Space.World the rotation is applied around the world x, y, z axes.

JavaScript 
function Update() {
    // Slowly rotate the object around its X axis at 1 degree/second.
    transform.Rotate(Vector3.right * Time.deltaTime);

    // ... at the same time as spinning relative to the global 
    // Y axis at the same speed.
    transform.Rotate(Vector3.up * Time.deltaTime, Space.World);
}
using UnityEngine;
using System.Collections;

public class example : MonoBehaviour {
    void Update() {
        transform.Rotate(Vector3.right * Time.deltaTime);
        transform.Rotate(Vector3.up * Time.deltaTime, Space.World);
    }
}
import UnityEngine
import System.Collections

class example(MonoBehaviour):

    def Update():
        transform.Rotate((Vector3.right * Time.deltaTime))
        transform.Rotate((Vector3.up * Time.deltaTime), Space.World)

function Rotate (xAngle : float, yAngle : float, zAngle : float, relativeTo : Space = Space.Self) : void

Description

Applies a rotation of zAngle degrees around the z axis, xAngle degrees around the x axis, and yAngle degrees around the y axis (in that order).

If relativeTo is left out or sot to Space.Self the rotation is applied around the transform's local axes. (The x, y and z axes shown when selecting the object inside the Scene View.) If relativeTo is Space.World the rotation is applied around the world x, y, z axes.

JavaScript 
function Update() {
    // Slowly rotate the object around its X axis at 1 degree/second.
    transform.Rotate(Time.deltaTime, 0, 0);

    // ... at the same time as spinning it relative to the global 
    // Y axis at the same speed.
    transform.Rotate(0, Time.deltaTime, 0, Space.World);
}
using UnityEngine;
using System.Collections;

public class example : MonoBehaviour {
    void Update() {
        transform.Rotate(Time.deltaTime, 0, 0);
        transform.Rotate(0, Time.deltaTime, 0, Space.World);
    }
}
import UnityEngine
import System.Collections

class example(MonoBehaviour):

    def Update():
        transform.Rotate(Time.deltaTime, 0, 0)
        transform.Rotate(0, Time.deltaTime, 0, Space.World)

function Rotate (axis : Vector3, angle : float, relativeTo : Space = Space.Self) : void

Description

Rotates the transform around axis by angle degrees.

If relativeTo is left out or set to Space.Self the axis parameter is relative to the transform's local axes. (The x, y and z axes shown when selecting the object inside the Scene View.) If relativeTo is Space.World the axis parameter is relative to the world x, y, z axes.

JavaScript 
function Update() {
    // Slowly rotate the object around its X axis at 1 degree/second.
    transform.Rotate(Vector3.right, Time.deltaTime);

    // ... at the same time as spinning it relative to the global 
    // Y axis at the same speed.
    transform.Rotate(Vector3.up, Time.deltaTime, Space.World);
}
using UnityEngine;
using System.Collections;

public class example : MonoBehaviour {
    void Update() {
        transform.Rotate(Vector3.right, Time.deltaTime);
        transform.Rotate(Vector3.up, Time.deltaTime, Space.World);
    }
}
import UnityEngine
import System.Collections

class example(MonoBehaviour):

    def Update():
        transform.Rotate(Vector3.right, Time.deltaTime)
        transform.Rotate(Vector3.up, Time.deltaTime, Space.World)