These are a set of 39 flags, 26 letters, 10 numbers, 3 substitute flags and one answering pennant. They are used by ships at sea to indicate various conditions of the ship and the activities it is engaged in. Examples of this would be if a vessel had a diver down and was warning other nearby ships to stay clear.
| N | No, negative. |
| O | Man overboard. |
| P | The ship is about to leave port; Your lights are out or burning badly. |
| Q | My ship is healthy and I request free pratique. |
| R | No signal. |
| S | My engines are going full astern. |
| T | Keep clear, I am engaged in pair trawling. |
| U | You are standing into danger. |
| V | I require assistance. |
| W | I require medical assistance. |
| X | Stop carrying out your intentions and watch for my signals. |
| Y | I am dragging my anchor. |
| Z | I require a tug; I am shooting nets. |
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