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 P (Papa)�flag by itself indicates "All persons should report on board as the vessel is about to proceed to sea" in harbour. At sea it may be used by fishing vessels to mean�"My nets have come fast upon an obstruction."