Leverage Drilling - This drilling produces the greatest amount of track flare. The Pin and CG are located 3-3/8" from the bowlers PAP.
Lift - A release where the bowler imparts upward motion on the ball as the thumb exits the ball. The weight of the ball rest on the pads of the fingers allowing the bowler to impart rotation on the ball.
Light - Missing full contact with the target pocket. For right-handed bowlers, contact is to far right.
Lofting - Releasing the ball so that it hits far past the foul line as if one had thrown it rather than rolled it.
Mark - Can mean either a strike or spare or the target which the bowler is aiming for.
Messenger - A pin that comes back across the pin deck to knock down other pins.
Mid Line - Terminology used on drill sheets. It is the horizontal line that extends from the center of grip at 90 degrees to the grip centerline.
Mid Plane - Terminology used on drill sheets it is also called the vertical axis line. It is the vertical line that runs vertically through the PAP.
Moment of Inertia - By definition, is the resistance to rotating motion. Mathematically, it is equal to the mass times the distance squared.
Oil - The lubrication of the lane which attempts to safeguard it from damage, usually consist of a mineral based oil.
Oily - Condition of the lane which due to heavy amounts of oil makes it difficult to hook the ball.
Open - A frame that does not include a strike or spare.
Over - The difference of the bowler's average score above the average 200 par score.
Perfect Game - A three hundred score from twelve uninterrupted strikes.
Pin - One of ten targets in a particular position at the end of the lane. They must weigh between three pounds six ounces and three pounds ten ounces.
Pin Deck - The area on the lane where the pins are arranged.
Pin in - This is a ball that has the pin and center of gravity within 1 inch of each other.
Pin out - This is a ball that has the pin and CG greater then 2" from each other.
Plastic Balls - Bowling balls made of polyester.
Pocket - The desired position of contact. For right-handed bowlers, it is situated between the first and third pins.
Positive Axis Point - This is the point that the ball initially wants to rotate about when the bowler releases it.
Radius of Gyration (RG) - This is a measurement of the effective weight distribution in a ball as it relates to the moment of inertia. USBC limits are 2.430 - 2.800
Reactive Resin Balls - Balls made of urethane developed in the early 1990's, balls capable of creating greater entry angles easier than urethane balls made before that time.
Resurface (ball) - Ball maintance performed by pro shops in order to remove the ball track form the ball and restore the ball surface to it's original condition.
Reverse Block - A lane condition in which more oil is applied to the outside boards than the inside. This condition is usually applied to keep the scores down and create a premium on shot making.
Revolutions (Revs) - Number of complete 360 degree turns it takes a bowling ball to complete in order to get from relase to point of contact .
Roll Out - A term used to describe a ball that has made it's turn at the breakpoint and began going in a straight line. Visually looking like it has stopped hooking.
Scratch - Term used to descibe a bowler who receives no handicap.
Spare - Knocking down the remaining pins left from the first delivery with the second attempt, score for the frame is 10 plus the count from the next delivery.
Strike - Knocking down all ten pins with the first delivery, score counts 10 plus the count of the next two deliveries.
Strike Out - A string of strikes which begins in any frame and continues until the end of the game.
Surlyn - The common material used to cover bowling pins.
Turkey - Three successive strikes.
Turn - The hand movement which allows the ball to spin around the desired axis of rotation.
USBC - Governing body of bowling in the United States formed January 1, 2005.
Urethane - A material used on bowling balls that became popular in the early 1980's.
Venting - Relieving suction of the thumb hole by drilling a small hole next to the thumb hole.
Void - A pin's internal open space, controls the pins center of gravity.
Washout - Leave after first ball where the 1, 2, 4, 7, 10 , 1, 2, 4, 10, or 1 , 2, 10 pins are left standing occurs when the ball misses the pocket to the outside but is still hooking towards the pocket. Opposite or inverse for left-handed bowlers 1, 3, 6, 7, 10, 1, 3, 6, 7 or 1, 3, 7.
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