The following is a glossary of the terminology currently used in the sport of golf. Where words in a sentence are also defined elsewhere in this article, they appear in italics. Old names for clubs can be found at Obsolete golf clubs. 0–9 19th hole The clubhouse bar. A B Back nine The last nine holes of an 18-hole golf course. Playing the back nine is called "heading in". Backspin A backwards spin that occurs when a player strikes the golf-ball. The spin causes the ball to stop quickly or spin backwards after landing on the green. Back-swing The first part of the golf-swing. The back-swing starts with the club-head immediately behind the ball and ends when the club-head travels back behind the player's head. The term take-away refers to the first part of the back-swing. Ball A small sphere used in playing golf, which is intended to be struck by a player swinging a club. Balls are usually white, covered in dimples, and made of a variety of materials. Ball-marker A token or a small coin used to spot the ball's position on the green prior to lifting it. Ball-washer A device found on many tees for cleaning golf balls. Banana-ball The result of a severe slice that results in a trajectory in the shape of a banana. This is also referred to as an extreme slice. Bandit See Sandbagger. Bare lie When the ball lies directly on hard ground without any grass to buoy the ball up, (i.e.), where there is no grass creating a gap between ball and the ground. Applicable when practicing off hard mats. Best ball A form of team play using two-, three-, or four-person teams. The team score on each hole is the lowest score obtained by one of the team members. For example, if player A has a 5, player B has a 6, player C has a 4, and player D has a 5, the "best ball" and team score is a 4. BiarritzA hole whose green incorporates a deep gulley that effectively splits the putting surface in two. Named after a famous example at "Le Phare Golf Club" in Biarritz, France. This original par-3 3d hole by the ocean is long built over. BifurcationA proposal under consideration since the late 2010s by the sport's rulemaking bodies, The R&A and the USGA, to create separate rules for competitive and recreational play,