International Code of Signals

three flag IC hoists are now generally restricted to Medical meanings, with M as the first.

Where did you see the hoist, and who was flying it ?
 
It is something that an old retired RN Signaller put at the end of an email to me last night, and I would rather not show my ignorance, if I don't have to.
 
it does not seem to be an amateur radio acronym.....


EDIT

It could mean Where Are You, but that sounds a bit out of context.
 
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