First of all, the rhythm of the Chinese characters, the rhythm of the Chinese characters is generally two words and three words of the rhythm of the most compact and most catchy, which in turn to the two words of the rhythm of the strongest, so the slogan is generally two words.

Secondly, it is related to the ancient Chinese culture. In ancient times, when a family was named after a certain room, the word "hall, hall, room, room" would be added to it, which changed the original two-word name into a three-word name (for example, Tongrentang).

Lastly, it is simply to use the names of people and places, and the three-word names of people and places point to a strong point (such as the dog's death).