So, as far as I know:
Rising Sun - Military Ship Sunk
Meatball - Supply Ship Sunk?
Pennant - Merchant Ship Sunk?
I'd gather the Airplane means Aircraft shot down. (duh)
But what are the "half flags" - Damage dealt but not sunk? Unconfirmed sinking?
Also, I have seen in addition to these flags, one that is a red circle with a white center on a white field. I think it was used WITH these two flags, but might not have been. Any idea what it might have represented?
Unfortunately I can't seem to find that image at the moment....
And I have seen this:
used to show Pilots rescued...
Lastly - was this more or less standardized or did it vary from boat to boat?