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Product of sequences. The product operator for the product of a sequence is denoted by the capital Greek letter Pi â (in analogy to the use of the capital Sigma â as summation symbol). The product of a sequence consisting of only one number is just that number itself.
The circle is considered a symbol of unity, because all the regular polygons are embraced by the circle. It is also the symbol of infinity, without beginning or end, perfect, the ultimate geometric symbol. math.dartmouth.edu/ ~matc/math5.geometry/unit9/unit9.html. The Circle: Paradox and Paradigm.