the Three Religions (Daoism, Confucianism, Buddhism) and Nine Schools (Confucians, Daoists, Yin-Yang, Legalists, Logicians, Mohists, Political Strategists, Eclectics, Agriculturists)
fig. people from all trades (often derog.)
Definitions (Wiktionary)
noun, derogatory, often
people from all walks of life