Quincunx:  An arrangement of [typically five] objects in a square or rectangle, with one at each corner and one in the middle, like the five spots on dice (from the Latin for “five-twelfths”).

Now there’s a word I don’t remember ever seeing before, and certainly have never heard spoken (seen now in Nassim Taleb’s The Black Swan: The Impact of the Highly Improbable, in the context of Galton’s mechanical experiments on Gaussian curve formation). Quincunx. It sounds like a hiding place for Lord Voldemort.