Lanyard
Workplace safety equipment term, essential site vocabulary
A cord designed to hold something around the neck, usually with a clip at the end on which to fasten the object. Used for easy exposure and/or quick access to an ID badge, keys, etc.
"We could tell who the roadies were at the rock concert, because they each wore an 'all-access backstage pass' on a lanyard." "Oh, so THAT'S what those things are called."