https://en.wikipedia.org/wiki/6
Six is a mystical number and ambivalent in its meaning, as it is the number of perfect balance and order. It can well predispose to union with the divine, but at the same time it can generate confusion, disturbance and illusion. Therefore, the meaning of Number Six is based on the term "ambivalence".
Its ambivalence is represented graphically by the six-pointed Star (Solomon's Seal) which allows us to understand the contradiction inherent in the number Six. The 6-pointed star is formed by the union of two Triangles: the one with the point down, indicates materiality; the one with the point up, instead spirituality. While the five-pointed Star corresponds to the microcosmic dimension, to the individual man, the 6-pointed Star corresponds to the macrocosmic dimension, to the universal man.
The interaction of the two triangles is the embodiment of the union between heaven and earth, between the masculine polarity and the feminine polarity, generating the harmony of opposites; but at the same time it indicates the object and its reflection, the distorting mirror image.
The number 6 evokes the initiatory test, the fundamental choice that implies the active commitment of the initiate to follow the path of spiritual elevation, without getting lost in illusions.
The number 6 which in ancient times was consecrated to Venus is considered a symbol of beauty and perfection. In the ancient Mysteries it was important because it offered the Six dimensions of all bodies plus those of height and depth, or the four cardinal points added to Zenith and Nadir.
It is important to "not put" three numbers six side by side, you would get a three-digit number that is better not to have on any surface ... bad luck.