Polo playing is a sport that has been around for centuries. It is a team sport that involves two teams of four players each, who use mallets to hit a small BALL into the opposing team's goal. The game is played on horseback and requires skill, agility, and strategy. The term 'polo playing' is derived from the name of the game, which is derived from the Tibetan word 'pulu, ' meaning 'BALL.' TERI is an acronym for The Equine Research Institute, which is an organization dedicated to the study and promotion of equine sports, including polo.