Non-specialized nozzle retailing platforms and no-brand standard market nozzle manufacturers tend to see nozzles through a perspective of simple, rigid machining processes – they often consider the only important requirement for a nozzle is the orifice diameter. However, the nozzle orifice diameter is not always so easily defined, take the example of the fan-shaped nozzle – its orifice is in the shape of an olive (or an eye), making it impossible to determine its orifice diameter by mere observation.