up to date during a game. mat: a rectangular piece of material, which designates the point from which bowls must be delivered for a particular end. matching bowl: a bowl that sits next to or near an opposition bowl in the head. maximum length: the maximum distance possible between the mat and the end of the rink, designated by a spot or mark, usually the 2 metre mark. measure: (instrument) a small pocket sized hand held tape measure used to judge the distance between the jack and one or more bowls at the conclusion of an end, which will determine the number of shots held by a player or team. (distance) if at the conclusion of an end of bowls, the number of shots held by a team or player cannot be determined by agreement, the designated measurer will use a tape measure to determine the result - "Call for a measure". minimum length: the minimum distance allowed between the mat and the jack. In the crystal mark edition of rules, the minimum length of an end is 23 metres. Some domestic regulations can vary this minimum length. For example, in Australia, the minimum length is 21 metres. Most greens have a mark on the plinth of the ditch to indicate the minimum length point from the 2 metre mark. mirror: a custom designed instrument, used by umpires to determine if a jack or bowl is within the boundary of the rink during play. Often used in conjunction with a scope when making judgements from one end of the rink to the other.. N narrow: (bias) a narrow bias describes the relatively narrow line that a bowl's arc takes from the point of delivery to the point at which it stops. Modern manufactured bowls are known as "narrow bias" bowls as they are designed to take a narrower line, compared to some older brands of bowls manufactured decades ago. Bowls must comply with minimum bias standards determined by World Bowls but vary to suit different styles of play and different playing conditions throughout the world. (bowl) if a bowl is delivered and finishes to the inner side of the intended target, it is said to have been a "narrow bowl". north–south: describes the direction of play for the rinks, which run in parallel with each other on any given day. Most bowls rinks are built to accommodate play alternately in