I have never seen a "refee" at a high school volleyball game. There are two referees, the R1 who works from the elevated stand and the R2 who is on the floor at the opposite end of the net, near the scoring table.
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It matters if it's professional. If not, there can be a few as 1. If professional, there are 2-3 referees.
There's a referee, who stands on the high platform. Then and umpire who stands on the ground across from the referee. And then two linesmen who call out or in.
6, it takes 4 on the field and 2 to watch the video screen on the sidelines for false starts, holds, etc.
11 officials
1-refree
1-assistant refree
1-scorer
1-table official
1-commissionerof match
6-lines judges