A group of three people (a trio), often used for musical three-person ensembles or any three-person group.
そのジャズ・トリオは明日の夜ライブをする予定だ。
That jazz trio is scheduled to play live tomorrow night.
私たち三人で小さなトリオを作って旅行に出かけた。
The three of us formed a small trio and went on a trip.
そのバンドのトリオ編成はギター、ベース、ドラムだ。
The band's trio lineup consists of guitar, bass, and drums.