 Besides the common meaning of "a soul", "po" was a variant Chinese character for "po" "a lunar phase" and "po" "dregs".The "Book of Documents" used "po" as a graphic variant for "po" "dark aspect of the moon" – this character usually means "ba" "overlord; hegemon".For example, "On the third month, when (the growth phase, ) of the moon began to wane, the duke of Chow [i.e., Duke of Zhou] commenced the foundations, and proceeded to build the new great city of Lǒ" (tr.