They are a variety of uses for pins. Safety pins are used to hold things in place such as clothing. Push-pins are used in a cork board for flyers and other forms of paper.
sewing uses pins so you can take up sewing bowling wrestling
LGA uses flat pads for the processor sockets instead of pins.
DDR SDRAM uses 184 pins.
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Orthopedic surgery often uses metal pins. The materials used in these pins (and other hardware) include stainless steel and titanium alloys.
XLR uses 3 pins, in order 1 = ground, 2 = hot, 3 = cold. You connect those to three pins in the 25 pins, but you need to check the manual of the connected unit which pins to connect them to.
There are many other uses for hair pins other than being used for hair. Like in the movies they are used as a lock pick, something that can be translated into real life; should you ever need one.
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Golf uses putters and pins. Gymnastics uses parallel bars and a pommel horse. Hockey uses a penalty box.
It is used to temporarly hold pins and needles in a fixed area (the pin pad). simply stick the pins or needles into the pin pad and away you go.
24 pin
24 pin