» For Sir Francis Galton's machine for demonstrating the normal distribution named "quincunx", see bean machine. A quincunx (IPA ['kwɪnkʌŋks]) is the arrangement of five units in the pattern corresponding to the five-spot on dice, playing cards, or dominoes. The quincunx was originally a coin issued by the Roman Republic c.211-200 BC, whose value was five twelfths (quinque + uncia) of an as, the Roman standard bronze coin. On the Roman quincunx coins, the value was sometim… (More on Quincunx)