jousisokka

Noun

 * 1) R-clip, R-pin, R-key, hairpin cotter pin, hairpin cotter, bridge pin, hitch pin, spring cotter pin type of fastener made of a springy rod and shaped like the letter "R", commonly used to secure the ends of round shafts
 * 2) spring pin mechanical fastener used to secure machine parts relative to each other through spring action