Kendall's notation
properNoun
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A notation used to characterize queueing systems.
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Originally, "A/S/c", with "A" the arrival process, "S" the distribution of service time required, and "c" the number of servers.
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Extended, "A/S/c/K/N/D", the above, plus "K" the number of places in the queue, "N" the size of the population, and "D" the service discipline.