Why put "signs" in the weather forecast?

Signs should be hung in front of shops as signs. The "signboard" here is an image metaphor, comparing the cloud to the "signboard" of the weather. People can infer what the weather would be like without white through various changes of clouds. So clouds are like a sign of the weather. (Metaphor means analogy. )

Interpretation of "signboard" in Zhu Yongxi's "Looking at the weather through clouds": ontology: cloud; Vehicle: signboard. Similarities: Both of them have indication function. But the signboard is more obvious, close to life and easy to understand. Therefore, the signboard is used as a metaphor, which is vivid. The word "signboard" is figurative here. Its original meaning refers to the sign hanging in front of the store, indicating the name of the store or the goods sold. As a symbol of the store, it is used here to vividly illustrate the close relationship between clouds and weather. The appearance of clouds is closely related to the change of weather. By observing different forms of clouds in the sky, we can know what kind of weather will be there.

Extended data:

Keywords: "signboard"

Synonym: trademark

Explanation: A trademark is a sign used to distinguish one operator's brand or service from other operators' goods or services. China's Trademark Law stipulates that trademarks approved and registered by the Trademark Office, including commodity trademarks, service trademarks, collective trademarks and certification trademarks, enjoy the exclusive right to use trademarks and are protected by law. If it is a well-known trademark, it will be protected by cross-category laws.

Origin: The origin of trademarks can be traced back to ancient times, when craftsmen printed their signatures or "marks" on their artworks or practical products. Nowadays, these signs have evolved into a universal trademark registration and protection system in the world today.