Maritime Flag S — Sierra Throw Pillow

This maritime flag represents the letter S (called "Sierra") in ICS (International Code of Signals) and NATO maritime standards. It can be used with other flags to spell a message. In ICS, a single S flag can mean "I am operating astern propulsion (e.g. moving backwards)." The S flag can be combined with other flags for specific shorthand messages such as MS1, which means "This vessel is a dangerous source of radiation; approach from the starboard side"; OS, which means "Watch for mines in this area"; or PS, which means "Do not come any closer." "S" is the seventh most commonly-used letter in English. Write your own messages with S and other maritime flags!