Trigon was a form of ball game played by the ancient Romans. The name derives from the Greek τρίγωνος, and may have been a romanized version of a Greek game called τρίγων. It was a type of juggling game, probably involved three players standing in a triangle and passing a hard ball back and forth, catching with the left and throwing with the right hand. Besides the three players, called trigonali, there were also assistants called pilecripi, who kept score and retrieved runaway balls.