The more accurate word in English is Area, while Square means square. For Chinese, the English word for perimeter is divided into two parts, one is the perimeter of a polygon, and the other is the perimeter of a circle. Therefore, in Britain and the United States, the area is generally represented by A, while the perimeter is divided into P and C. Many China students may not adapt after going abroad.
Another explanation is that s is equivalent to Size in English, indicating size, but if size is expressed in English, it is closer to dimension.
Based on the above, China's mathematics should be further integrated with the world. Since English letters are used to express mathematical formulas, they should be universal, so as not to hinder or restrict development.