A closing pin is a curved piece of stainless steel metal used in the sport of skydiving.
[1] The pin is sewn onto the bridle, which is a 7- to 10-foot-long piece of nylon webbing connected to the pilot chute.
[4] When the pilot chute is thrown out by the skydiver and catches air, it pulls the closing pin from the closing loop and allows the main parachute to be released from the container and inflate.
The closing pin is often worn as a piece of jewelry on necklaces and bracelets.
Used as a fashion accessory, the closing pin serves as a symbol – allowing skydivers to recognize one another and their mutual love of the sport.