A muon is a short-lived subatomic particle classified as a lepton. If a muon feedback beam was initiated while a full intensity power transfer was being conducted, a buildup of muons would develop in the warp core. If that ship was to then go to warp speed, the warp engines would explode.
A ship with a Muon Token assigned to it follows these special rules:
1. A Muon Token stays with a ship until it is removed.