Interlocking grip
Grip style where (for right-handed players) the pinkie finger of the right hand is hooked around the index finger of the left. Jack Nicklaus and Tiger Woods use the interlocking grip.

Inward nine
The back nine holes, so named because older links courses were designed to come back "in" toward the clubhouse after going out on the front nine.

Iron
A club with a flat-faced solid metal head generally numbered from 1 to 9 indicating increasing loft.