It means 15 fish.

15 means a lifetime of happiness. From the perspective of geomantic omen, 15 stands for happiness, for gathering wealth and for being blessed all one's life.

Fish is an animal that we often see. It has a beautiful meaning in the traditional culture of China. For example, people often say that the New Year lasts more than one year, and the image of fish often appears in New Year pictures. In the traditional culture of China, fish is also a symbol of good luck, and the image of fish often appears in freehand brushwork paintings. But in freehand brushwork painting, it is not a single fish as the main body, but a supporting role in the picture, which plays a supplementary role.