The term 'eight-piece' is often used to refer to an OCTET, which is a group of eight musicians or singers. An OCTET can be composed of any combination of instruments, including strings, brass, woodwinds, and percussion. The term is also used to describe a set of eight pieces of furniture, such as chairs, tables, or couches. In mathematics, an OCTET is a set of eight numbers that can be arranged in a variety of ways.