public class Element : MonoBehaviour
{
    void OnMouseOver()
    {
        // Left Mouse Button
        if (Input.GetMouseButtonDown(0))
        {
             Debug.Log(gameobject.name);
        }
    }
}

    void OnMouseOver()
    {
        // Left Mouse Button
        if (Input.GetMouseButtonDown(0))
        {
             Debug.Log(this.gameobject.name);
        }
     }

    void OnMouseOver()
    {
        // Left Mouse Button
        if (Input.GetMouseButtonDown(0))
        {
             // Проводим нужные действия с данным объектом
        }
     }

    void Update()
    {
        var ray = Camera.main.ScreenPointToRay(Input.mousePosition);

        RaycastHit hit = new RaycastHit();

        if (Physics.Raycast(ray, out hit))
        {
            var clickMove = hit.collider.gameObject.GetComponent<ClickMove>();
            clickMove.OnClick(hit.point);
        }
    }

using UnityEngine;

using System.Collections;

public class ExampleClass : MonoBehaviour {

    void Start() {

    // Instantiates a prefab named "enemy" located in any Resources
    // folder in your project's Assets folder.
  GameObject instance = Instantiate(Resources.Load("enemy", typeof(GameObject))) as GameObject;

    }

}

    void OnMouseOver()
    {
        if (Input.GetMouseButtonDown(0))
        {
        }
    }