YELLOW JACK - Origin
Tuesday June 7th, 2011
As any seafarer will know a ‘jack’ is a flag and used to indicate a particular disposition of a vessel. In the case of the ‘Yellow Jack’ it was used to signify yellow fever. Basically it meant that the crew were sick and it was not advisable to board the ship. It was often used as a way of duping pirates into plundering prospective targets.