The Dart Board!

The clock board (also sometimes known as the London or Trebles board) has become the standard target for the game of darts. It is divided into scoring segments for the number 1 to 20 by a wire that is often referred to as the “spider”. The sequence of numbers may appear to be random, but it is in fact uniform, starting with 20 at the top. There is an outer ring for doubles, an inner ring for trebles, plus inner and outer bullseyes. – See more at: http://www.dartopia.com/?p=394#sthash.KmrFH9Re.dpuf