As we all know well, Pythagoras and those in his tradition that followed, ground their metaphysics in number and had a well developed system of numerology, within the context of which each number is a particular system unto itself, each reflecting to various meanings relevant to the number in question. For example, the Dyad, a system of twoness, extends its meaning to indefiniteness, unlimitedness, ration in proportion, matter, gender and so on.