What do you mean by 30

"30 _" is an ancient calculation symbol, which is said to have originated from the late Shang Dynasty to the Western Zhou Dynasty and was used to calculate the land area. It consists of two intersecting arcs and a straight line perpendicular to them. When calculating the area, use this vertical line to connect the two intersections of the arc, then divide the graph into four parts, and finally calculate the area. Although this calculation method is out of date, it is still an important symbol of China culture and represents an ancient and traditional calculation and measurement method.

In modern life, "30 _" still has a wide range of applications, especially in mathematics, physics and other fields. It is not only the basic unit of measurement, but also the symbol of measurement length and volume, and it is also one of the basic units in measurement law, laws and regulations. In addition, 30 represents an accurate and scientific measurement method and plays an irreplaceable role in industry, scientific research, medicine and other fields.

In addition to calculation and measurement, "30" also has a unique meaning in the field of culture and art. Its shape is simple, elegant and infinite, which embodies the idea of "harmony between man and nature" and "everything is connected" in China culture. Therefore, in China's fine arts, calligraphy and other artistic fields, the symbol "30" is often used as an element of patterns and designs, which represents the accumulation and precipitation of culture and also presents an ancient and elegant artistic style.