(1) In dot-matrix printers, the devices that press on the ink ribbon to make dots on the paper. Printers are classified by how many pins they have on the printer head. The more pins a printer has, the higher-quality type it is capable of producing. Dot-matrix printers can have anywhere from 9 to 24 pins. A 24-pin printer can produce letter-quality print.
(2) A male lead on a connector.
(3) Silicon chips have an array of thin metal feet (pins) on their underside that enables them to be attached to a circuit board. The pins are very delicate and easily bent. If they are damaged, the chip will not sit correctly and will malfunction.