iron [1]
Club used to hit the ball on the fairway or green. Irons are numbered from 1 to 9, according to the length of their shafts and their range; the angle of the sole increases in inclination to create curved trajectories of varying heights.
sole 
Lower part of the club’s head.
heel 
Part of the club’s head under the neck.
toe 
Tip of the club’s head, opposite the heel and the shaft.
ferrule 
Ringlike part at the joint of a club’s shaft and head that holds them securely together.
neck 
Upper part of the club’s head into which the shaft fits.
groove 
Fine indented lines on the face of the club that provide maximum control of the ball.