What does s stand for?

S stands for south. When facing the sun in the morning, the direction on the right hand side is south. The earliest source of Nan can't be verified, but it was used to indicate the orientation when it appeared, and it was borrowed to indicate the orientation in the Oracle inscriptions of Yin Ruins.

One of four great inventions of ancient china, the compass (called Sina in ancient times), the south pole of the magnetic needle points to the geographical south pole (the north pole of the magnetic field). Later, it was used in geography, geomantic compass and navigation compass.

Nan also represents a surname in China. In martial arts novels, you can often see a martial arts expert named Nan. In the history of China, there are also many famous celebrities named Nan, such as Nan Tianxiang, the magistrate of Jiangnan in Qing Dynasty, and Nan, the magistrate of Huguang.