What does "nine hurdles" mean?

Gou Chen is one of the twelve gods of the ecliptic and the underworld. He is a fierce god.

There are twelve kinds of ecliptic, which are Sima, Gouchen, Qinglong, Tang Ming, Tianxun, Suzaku, Jingui, Tiande, Baihu, Yutang, Tianlong and Xuanwu in turn. Among them, Qinglong, Tang Ming, Jingui, Tiande, Yutang and Siming are the gods of the twelve zodiac animals; Natural punishment, Suzaku, White Tiger, Tianlong, Xuanwu and Gouchen are the gods of the underworld. The zodiac is the master of luck, while the underworld is the master of evil. The Zodiac God is on duty and everything goes well. Even if you meet Tai-sui, general and punishment month, you don't have to avoid it. All murders will be avoided. Mafia gods are on duty, and everything is taboo. In particular, it is forbidden to build houses, move, travel, get married or leave the army.