Gaelic football is an Irish team sport. It is a form of football derived from traditional Irish ball games. It is played between two teams of 15 players on a rectangular grass pitch. The objective of the sport is to score by kicking or hand-passing the ball over the crossbar, signaled by the umpire raising a white flag. A goal is awarded for kicking the ball under the crossbar into the net, signaled by the umpire raising a green flag. Players advance the football, a spherical leather ball, up the field with a combination of carrying, bouncing, kicking, hand-passing, and soloing (dropping the ball and then toe-kicking the ball upward into the hands).Positions in Gaelic football are similar to that in other football codes, and comprise one goalkeeper, six backs, two midfielders, and six forwards.