The term TRIO FIVE is a crossword solution that can be interpreted as OCTET, which is a musical composition for EIGHT performers. An OCTET is a type of ensemble that typically consists of two string quartets, two woodwind quartets, or a combination of the two. It is also sometimes referred to as an octuple ensemble. The term is derived from the Latin word octo, meaning 'EIGHT'. Octets are often used in classical music, jazz, and other genres.