trio 
/ˈtri:joʊ/ noun
plural tri·os /ˈtri:joʊ/ noun [count] 1 : a group of three singers or musicians who perform together
▪ He plays in a jazz trio. ; also : a piece of music for such a group
▪ a piano trio 2 : a group or three people or things
▪ a trio of novels
▪ He plays in a jazz trio. ; also : a piece of music for such a group
▪ a piano trio
▪ a trio of novels
