Answer:
elastic force?
well I hope im giving you the correct definition...
something that is elastic can be stretched or compressed. 
For example a bungee cord(search up). It resists the change of shape even when stretched and compressed. And because of that it applies a counter force in the opposite direction in which you would call a elastic force. 
 
        
                    
             
        
        
        
Can you at least post the picture so i can see