mail flag
noun Nautical.
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.
Nearby words
mail, mail bomb, mail car, mail carrier, mail drop, mail flag, mail merging, mail order, mail-cheeked, mail-in, mail-order
Dictionary.com Unabridged
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019