It's called DDD - Die Deterioration Doubling. Caused by a worn die. Common on Copper Plated zinc cents. Nothing to do with Hub Doubling which create a Doubled Die variety.
http://doubleddie.com This website will give you information about true Doubled Die issues and worthless Doubling.
I agree DDD as paddyman98 stated but then if memory serves me I don't think I ever disagree with him. LOL Dave