A board pin is a device used for fastening objects or material together, and can have three sorts of body. A bulletin board also called as a pinboard, pin board, noticeboard in British English, is a surface intended for the posting of public messages, for example, to advertise items wanted or for sale, announce events, or provide information. According to their function, pins can be made of metals. The development of the pin closely paralleled that of its perforated counterpart, the needle. Archaeological evidence suggests that curved sewing pins have been used for over four thousand years. Originally, these were fashioned out of iron and bone by the Sumerians and were used to hold clothes together. Later, pins were also used to hold pages of books together by threading the needle through their top corner.