cotter pin: a cotter consisting of a split pin that is secured (after passing through a hole) by splitting the ends apart
cotter: fastener consisting of a wedge or pin inserted through a slot to hold two other pieces together
static line: a cord used instead of a ripcord to open a parachute; the cord is attached at one end to the aircraft and temporarily attached to the pack of a parachute at the other; it opens the parachute after the jumper is clear of the plane