A type of metal fastener in the form of a pin that originally was bent 180° so that the point was held in a catch-plate, but later was bent, first in a complete turn and then 180°, which resulted in a small spring that, by tension, more securely held the point in the catch-plate. Such pieces were the precursor of the fibula and of the modern safety pin.
Modern examples have a guard over the catch-plate, which protects the user from being pricked.
The safety pin has four parts:
Some modern examples are made of gold, to be used as a collar pin or, in larger size, to fasten a Scottish kilt.
From: An Illustrated Dictionary of Jewelry, autor: Harold Newman, publishers: Thames and Hudson