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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.
Plastic products are\r\n commonly marked with a number enclosed by the recycling symbol, which is typically\r\n found on the bottom of the product. This symbol is used to identify the plastic\r\n and recyclability of the product.his symbol is used to identify the plastic and recyclability of the product. In general plastic products marked with the numbers 2, 4 and 5 are the safer choices. The following graphic is a quick summary of the plastics labels and their âthreatâ level. The following sections provide information on each type of plastic.