Have there been any discussions of the flag alphabet? (Signal flags).
They are not that infrequently used online or in print, although the concentration tends to be higher in publications/sites geared to nautical audiences (not that different from chess pieces and chess publications).
Now, before you leap on the "it's just a font" bandwagon, consider that the signal flags not only represent letters and digits, but also contain special pennants for functions like "repeat once" to "repeat four times" as well as a number of special flags that are associated with two-letter codes.
Also, the use of certain individual flags has conventional meanings other than the letter itself, so a reference to the flag in text would not necessarily survive a font substitution, because you'd lose the fact that you are talking about flags.
Some of these uses have spread to enthusiasts, for example divers like to use the old "PO" flag (that curiously is now obsolete for this purpose) as a logo for their sport. The "diver down flag" (flag "A") is now a different one in the International Regulations for the Prevention of Collisions at Sea (IRPCAS), but for e-moji style use that would not matter as the other one (whatever it's origin) is now the recognized tribal symbol for divers.
It seems to me that when schemes for representing sets of flags are discussed, it would be useful to keep open the ability to use the same scheme for signal flags -- perhaps with a different base character to avoid collisions in the letter codes.
A./
