formations and variations (playbook)
playbook: (American Football) A term describing the total collection of plays that a team has practiced and could potentially run during a game. The offense, defense, and special teams will all have specific playbooks with the complete set of plays that can be called in each situation. A playbook is usually a physical binder given to players when they join a team. Players who are traded or released from a team are always asked to turn in their playbook before they leave to keep other teams from getting their hands on their plays.