A short piece of rope or line used as a handle or tied-on to some other object.
A wrist-lanyard is a loop of thin rope with a sliding toggle, which may be tightened around the wrist to secure the object (usually a torch or a camera) attached to it.
When SCUBA diving, it is better to secure a camera by means of a wrist-lanyard than by using a neck-strap, since the mouthpiece must be removed in order to take a neck-strap on and off.