A type of event that a stage can send to a ship. It is sent through the Admin object with
admin:sendEvent(ship, event). The event can be any native Lua value: number, string, boolean, nil, or table of any combination of these types, including nested tables. A ship can retrieve them from the Sensors object with
sensors:stageEvents(). Since these values can be anything, a ship needs to be designed to understand the event format used by the stages it is run on.