signs, as a special way of human intuitive contact, are not only ubiquitous in social activities and production activities, but also for the fundamental interests of the country, social groups and even individuals. It shows its extremely important and unique function more and more. For example, the national flag and national emblem, as symbols of a country's image, have special meanings that are difficult for any language or writer to express accurately. Public place signs, traffic signs, safety signs, operation signs, etc., have intuitive and quick effects on guiding people to carry out orderly and normal activities and ensuring the safety of life and property. Trademark, store logo, factory logo and other special signs have great practical value and legal protection for developing economy, creating economic benefits and safeguarding the rights and interests of enterprises and consumers. Almost all major domestic and international events, conferences, sports meetings, postal services, finance and trade, institutions, organizations and even individuals (stamps and signatures) have signs that show their own characteristics. These signs play the role of communication, exchange and publicity from various angles, promote social, economic, political, scientific and technological and cultural progress, and protect their respective rights and interests. With the increasing frequency of international communication, the intuitive, image-free and language-free features of signs are extremely beneficial to international communication and application. Therefore, international signs have been rapidly promoted and developed, becoming one of the most effective means of visual transmission and an intuitive contact tool for human communication.