The Barker's dozens are composed of exactly 13 dog biscuits.
More seriously, a Baker's Dozen is also 13.
And, interestingly, it began to be used in the 13th century when a law was written that dictated severe punishment for merchants if they undersized a product when sold as a dozen (12). It became standard for them to give out a "long dozen" just to be extra sure that they could not be charged with shortchanging a customer by giving fewer than twelve in the dozen.
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