In volleyball there are 4 officials. One that is called the "up ref" which is the ref that is on top of a small ladder on one end of the net. There is also a ref that stands on the ground in front of the scoreboard table and book table. The other two refs are called linesmen there are two of them one on each side of the court in opposing corners to tell if the ball was in or out of the court.
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There can be from 2 to 3 softball umpires on the field at one time. There is a home plate umpire who is the head umpire on the field. There can also be a first base umpire and a third base umpire.