The sport you are referring to is called field hockey. In field hockey, referees use a stick with a flag on each end, known as a whistle or umpire's stick. The purpose of this tool is to help referees indicate various decisions or signals during the game. These signals can include signaling a foul, indicating a goal, or signaling a penalty corner. The flags on the stick help provide clear and visible signals to players, coaches, and spectators.
Referees use a stick with a flag on each end in the sport of American football. This stick is called a "down indicator" or "down box." The purpose of the down indicator is to indicate the current line of scrimmage, which is the position on the field where the next play will start. The referee moves the flags on the stick to signal the number of downs that have been played and keeps track of the position of the ball on the field.
