Pin is a kind of elastic pin, mostly made of metal. One end is fixed, the other end is sharp and can be opened and closed, mostly fixed with metal. Used to hold cloth, paper, etc. together. Divided into pins, and paper clips (paper clips, also known as safety pins).

In fact, the pin was invented in the middle of the 19th century. In order to find a useful piece of information from a large number of documents conveniently and quickly, people began to use a tailor's pin to pin up the document in one corner of the paper, but they often pricked their fingers. The idea of inventing a safe and effective office supplies came into being in almost three people's minds at the same time. But nowadays, it is generally believed that the inventor of the paper clip is the Norwegian mathematician John Waller, because the date on his design sketch is the earliest of the three - 1899.

In Norway, it has always made its people particularly proud. During World War II, the German occupation forces banned Norwegians from using buttons with the initials of the king of Norway. In order to emphasize their loyalty to the national tradition, they pinned paper clips on their clothes. Moreover, in February 1990, a 5-meter-high paperclip shaped stainless steel monument was erected in the center of the capital Oslo.

Source: @livaink