Baseball Arbiter is a term used to describe the person responsible for officiating a baseball game. This individual is commonly referred to as an UMPIRE (3 letters) or an UMPIRE (6 letters). An UMPIRE is responsible for making calls on the field, such as balls and strikes, fair and foul balls, and safe and out calls. They also have the authority to eject players, coaches, and fans from the game. Umpires must be knowledgeable of the rules of the game and must remain impartial throughout the game.