The outdoor wall flag is made of national flag fabric which is waterproof and sun-resistant. With stainless steel flagpole and pedestal, they have good anti-corrosion effect. As a new publicity item, it is mainly used for advertisement promotion, conference exhibition, enterprise publicity, etc.It has been difficult to know who designed the early signal flag. Because of the different geographical areas and fleets, there are distinctions in the style and use of signal flags. Prior to the birth of the International Code Of Signals, The Frederick Marryat flag system put into used since 1817 for merchant ships is said to be the most widely used signal flag system. According to Wilson's Marine Flag, until 1890, there are still ships using the Marryat signal flag. The shape and color structure of this set of signal flags are very similar to the international code of signals used today.