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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.
1 The products are the substances produced during the chemical reaction. 2  The reactants and products are connected by an arrow 3  (). The arrow may be read as to yield or to form or to give. 4  The reactants are placed on the left side of the arrow and the products on the right side.