In gridiron football, defensive backs (DBs), also called the secondary, are the players on the defensive side of the ball who play furthest back from the line of scrimmage. They are distinguished from the other two sets of defensive players, the defensive linemen who play directly on the line of scrimmage, and the linebackers, who play in the middle of the defense, between the defensive line and the defensive backs. Historic notable defensive backs include Dick "Night Trane" Lane, Mike Haynes, Ronnie Lott, and Troy Polamalu.