Via Kottke, we thoroughly enjoyed this hand illustrated overview of international maritime signal flags—developed and standardised to facilitate communication between ships over distances and language barriers, like the radio spelling alphabets (for both letters and numbers) which follow similar conventions to the same ends. The exercises in morphology and conveying more complex messages with heraldry (the above, per pale or and azure, has the lone syntax, “I wish to talk with you”—see previously on how such language has shifted) were fascinating and Rabbit Waves gives similar treatment to day-signs, markers used in lieu of signal flags, and semaphore.