1. A holy object that can be used for multiple purposes. These uses are: Putting things together, prying things out of things, eating with, fixing one's braces with, preparing food, an ear ring, nose ring, naval ring, a fashionable piece of metal that comes in handy, and many other things.
"Do you have a safety pin? I gotta hole in my shirt."
-Urban DictionaryA veritable cornucopia of streetwise lingo, posted and defined by its readers.
2. a metal pin that is used for attaching things and that has a point at one end and a cover at the other into which the pointed end fits
3.British English: safety pinA safety pin is a bent metal pin used for fastening things together. The point of the pin has a cover so that when the pin is closed it cannot hurt anyone....trousers which were held together with safety pins.