Five Dynasties and Ten Countries. What does "Five Dynasties" mean? Which countries does it consist of? How did the name China come from?

At the end of the Tang Dynasty, the glorious Tang Empire finally collapsed due to the disaster of Zhenchao, the chaos of eunuchs, the chaos of Huang Chao and the factional strife. But another great division of China after the Spring and Autumn Period, the Warring States Period and the Southern and Northern Dynasties. Since the end of the Tang Dynasty, it has usurped the Tang Dynasty to stand on its own feet, changed its name to Liang, and made Kaifeng its capital. After that, the Tang, Jin, Han and Wu Dynasties appeared one after another, and they were called the Five Dynasties with Liang. In addition to the Five Dynasties, there were many other separatist forces in southern China at that time, namely the Ten Dynasties, including Wu, Chu, Fujian, wuyue, Qian Shu, Houshu, Nanhan, Nantang, Jingnan and Beihan, collectively referred to as the Ten Kingdoms. Historically, it was called the Five Dynasties and Ten Countries, but in fact there were more than ten countries.