1) Part of a day 2) Spirit of the dawn 
In Lakota mythology (a Native American mythology, since Lakota is a branch of Santee Sioux), Anpao is an entity with two faces that represents the spirit of the dawn. George Bushotter (Yankton Dakota-Lakota, 1860–1892) wrote that when his younger brother was ill, he was told to pray to Anpao, the Dawn, and recovered. Anpao zi is the `yellow of ....
In Dakota mythology, Anpao is the spirit of the dawn.