(fencing) A tool used in electrical fencing to detect whether or not a weapon has struck an opponent, which connects to your fencer's weapon by a spool and human body wire. It uses lights and sound to notify a hit, with distinctive coloured lights for on goal and off target https://gabletoppak.com/from-plastic-bottles-to-gabletop-cartons-a-step-toward-solving-the-plastic-pollution-crisis/