The number two comes from the unit division and is the symbol of separation, because from a sacred point of view, the unit is in essence one and only. Two, as dyad, is the expression of duality. In a dualistic view of the world has the principle of separation of the material from the spiritual principle, and number two is the embodiment of opposites: male / female, day / night, earth / sky, etc. Being a dual principle, indicates both the contrast, the polarity, is the attempt at conciliation. So the two can be considered an ambivalent issue: in its positive function tries to reconcile opposites, to return to the union of wisdom and index, as an active search for a lost harmony, or have a negative character if it leads to disruption of ' units with clear division of opposites. The number Two, takes us inside a differentiation, not multiple, but based on a binary conflict that involves exclusion, and a rift: true or false, black or white, etc. The line is the geometric figure representing the two; In fact it has a connection with the symbolism of the cross in the pair of vertical and horizontal: the horizontal line indicates the material development, while the vertical spiritual elevation. In addition, the two being an even number, embodies the feminine energy and passivity. In fact, in ancient times the number Two was attribute of the Great Mother Earth.