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mail flag

noun, Nautical
1.
a flag of the International Code of Signals symbolizing the letter Y, flown alone by a ship to indicate that it is carrying mail: a square flag with red and yellow diagonal stripes.
2.
any of various other flags indicating that a ship is carrying mail.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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