Artron leash
From Tardis Wiki, the free Doctor Who reference
An artron leash was Gallifreyan technology. It was used to keep the person on the receiving end close to the other because if they were a certain distance apart, the person on the receiving end would be given an electric shock.
The War Ollistra attached the War Doctor with one, linking it to herself. (AUDIO: A Thing of Guile)
