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There is structure of matter symbolism in all of these symbols, and in key numerological symbols of myth. From the standpoint of string theory (actually, a version of string theory called M-theory) there are seven wrapped-up dimensions at every point of space/time, called a Calabi-Yau space. Cosmic strings vibrate within these seven dimensions, then tear space/time to form what the Dogon call "an eighth element"- the beginning of the next Calabi-Yau space. Consequently, the number seven represents completion - as reflected in the seven days of Shiva in Judaism; the number eight represents beginning - as reflected in the Judaic practice of circumcising on the eighth day.
The creation of matter is an inherently dual process in which wave-like unformed matter is transformed into the familiar particles and forces of formed matter. According to related Dogon and Egyptian references, that process produces a pair of coiled membranes, which are the Uraeus serpents.
The isosceles triangle is an Egyptian glyph which represents the concept "to be".