ǃXu is arguably the main god of the San of southern Africa. He is considered a benevolent and omnipotent supreme being. He is also the sky god to whom the souls of the dead go. He is said to "Summon the magicians to their profession, and gives them supernatural powers." (wikipedia entry)
A crater is a circular depression likely created by an impact event. On Rhea they are named after people and places from creation myths (with Asian emphasis).
Image Source. Marker locations are approximate and may not always appear to align with image on map.