What is "nine streams"?

The most classic is Ban Gu 96:

Confucianism, Mohism, Taoism, law, agriculture, name, yin and yang, vertical and horizontal, miscellaneous

But there are also novelists, military strategists and doctors. Novelists and ninth-rate writers are usually called ten.

In addition:

Medicine, divination, astrology, physiognomy, soap, official, prostitute, excellent, pawn.

Shangjiuliu: First-class Buddha, Second-rate Heaven, Third-rate Emperor, Fourth-rate Official, Fifth-rate Pavilion, Sixth-rate Prime Minister, Seven-rate (Jinshi), Eight-rate (Juren) and Nine-rate.

Zhong Jiuliu: First-rate scholar, second-rate doctor, third-rate painter, fourth-rate skin (shadow play), fifth-rate actor, sixth-rate gold (divination), seven monks, eight roads and nine chess.

The next nine streams: first-class platform, second-rate blowing, third-rate circus, fourth-rate pushing, fifth-rate pool, sixth back, seventh repair, eighth match and ninth prostitute.

"Shangjiuliu" are emperors, sages, hermits, children's immortals, literati, warriors, agriculture, industry and commerce.

The "middle nine streams" are: Ju Zi, Doctor, Xiang Ming, Dan Qing (painter), scholar, monk, Tao and Ni.

"Dirty servants" are: masters, servants, scales (scales), matchmakers, pawns, time demons (kidnappers and witches), thieves, thieves and prostitutes.