Signal flags are used to communicate messages to and from ships. These outdoor flags are crafted from durable nylon material, with extra stitching for long-life usage in marine environments.

Individual Size 0 letters (12" x 15") with header and grommet are stock items. All other sizes, and pennants made with rope and toggle, are made to order items and take 2-3 weeks for delivery.

The nautical code letter L (Lima) flag by itself indicates in harbour: "The ship is quarantined." and at sea: "You should stop your vessel instantly."