Duraluminum was a type of low corrosion and low fatigue Aluminum developed for the aircraft industry.It was in common use for years.The material was supplanted by newer alloys but the name persisted...
A model aeroplane is used for presentations and testing. Model planes are also used for fun. They are used model-plane clubs, aeroplane company headquarters and studios. (Bedroom, in my house)
The ancient Germanic tribes and the ancient Scandinavians used runes as an alphabet. Prior to that, they used runes for magic purposes, such as casting lots (divination) and spells of protection.