mail flag

nounNautical.

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.
any of various other flags indicating that a ship is carrying mail.

Words Nearby mail flag

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

How to use mail flag in a sentence

"This is a United States mail boat," and he pointed to the mail flag flying at the stern.
The Boy With the U. S. Survey | Francis Rolt-Wheeler

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