The term 'barbershop accessory' can refer to a variety of items used in barbershops. One such item is a STROP, which is a leather strap used for sharpening straight razors. The STROP is usually made of two pieces of leather, one side smooth and the other rough, and is used to hone the blade of the razor. It is an essential tool for barbers, as it helps to keep their razors sharp and in good condition.