Piggy Banks

Ever wonder why some people keep their savings in a money box shaped like a pig? No one invented the piggy bank, it is all due to the incorrect meaning of a word!
The origin of the piggy bank can be found in the Middle Ages, when most pots, dishes and other containers used in people's homes are made of cheap clay known as 'pygg'. Pygg is a type of orange clay, once widely used for making pottery in the form of jars, cookware, and other household items due to its economical characteristics. Metal was rarely used as it was too expensive. A pot made from pygg is kept by many households for storing the family's savings. This money-pot became known as, 'the pyggy bank'.
But when potters in the 18th century were asked by customers to make pyggy banks, they misunderstood and produced pig shaped containers. Instead of correcting the mistake, people took to the idea, and ever since, the piggy bank has been a well-loved type of money-box. The original pronunciation of "pygg" was probably closer to "pug," but over time the pronunciation changed due to the Great Vowel Shift and became a homonym of "pig". Piggy bank (sometimes penny bank or money box) is the traditional name of a coin accumulation and storage receptacle; it is most often, but not exclusively, used by children. Most modern piggy banks, however, have a rubber plug located on the underside; others are made of vinyl and have a removable nose for easy coin access. Some piggy banks incorporate electronic systems which calculate the amount of money deposited.