Quincunx

Quinconce (Quincunx) The arrangement of five units in the patter corresponding to the five-spot on dice, playing cards, or dominoes. A quincunx is often used in Hoodoo as a sort of "artifical crossroad" and can be created inside a room in the house. The quincunx or five-spot is generally used for scaling and fixing spells in place. "You see this pattern here? That's a quinconce, that's a five spot." "That's used for hoodoo spellwork, isn't it?" "[...] You fill [this flowerpot] with blood weed and you've got yourself a powerful charm to war off enemies." – Pad of Definitions (2.11 Playthings), Official Website

The reference and symbol appears to be derived from <ref>Lucky Mogo.