It stands for Outside Hitter. It's the person who plays on the left side of the course, both front and back but technically refers to them when they are in the front left, hitting the ball, obviously. Out of the 6 positions, there are always two outside hitters. Sometimes a defensive specialist will go through the back three rotations for them in the back though (there are 6 rotations in volleyball).
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Outside hitter. This person generally has the most hits or "kills" throughout games and is a big part of the teams offense. He/she usually also plays all the way around the court in all 6 rotations.
The position OH means Outside Hitter. Usually an outside hitter starts their approach out of bounds to hit the ball at a hard angle.