Color.grey

static var grey : Color

Description

English spelling for gray. RGBA is the same (0.5, 0.5, 0.5, 1).

JavaScript
    // Assign a grey color to this transform's material
transform.renderer.material.color = Color.grey;

using UnityEngine;
using System.Collections;

public class example : MonoBehaviour {
void Example() {
transform.renderer.material.color = Color.grey;
}
}

import UnityEngine
import System.Collections

class example(MonoBehaviour):

def Example():
transform.renderer.material.color = Color.grey