BusKill is a cheap kill cord Dead Man Switch to trigger the machine to self-destruct in case the laptop is stolen, it was designed by software engineer Michael Altfield. The idea is very simple, the BusKill cable connects a Linux laptop to the user, for example, to his belt. In case of theft, the cable disconnects from the laptop and triggers a udev script that executes a sequence of operations, from shutting down to wiping the device or deleting certain sensitive data on the disk.”]
Source: https://securityaffairs.co/wordpress/95979/hacking/buskill-kill-cord.html