An arrangement of five objects or marks with one at each corner of a rectangle or square and one at the center.
[Latin quīncūnx, quīncūnc-, five twelfths : quīnque, five; see penkwe in the Appendix of Indo-European roots + ūncia, twelfth part of a unit; see OUNCE1.]
(click for a larger image)quincunx
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