A "baker's dozen" refers to a quantity of thirteen items, typically baked goods like bread or pastries. This term originated in medieval England when bakers would include an extra item to avoid penalties for selling underweight loaves. By adding an extra item, they ensured they met the required weight and provided good customer service. The practice of giving a baker's dozen has continued over the years, and it is now commonly used in various contexts. It serves as a reminder of the importance of quality and customer satisfaction in the baking industry, as well as a fun way to refer to a slightly larger quantity.