Refers to the sport of volleyball. Commonly used in compounds like バレーボール選手 (volleyball player) or バレーボールの試合 (volleyball match).
週末に友達とバレーボールをした。
I played volleyball with friends on the weekend.
She is in her high school's volleyball club.
I played volleyball with friends on the weekend.
I'm going to watch a volleyball match today.
He is a famous volleyball player.
I was on the volleyball team in high school.