from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun A blue flag with a white square in the center, flown to signal that a ship is ready to sail.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun nautical A blue signal flag with a
white rectanglein the centre, signifying "P". When flownalone, indicatesthat a shipis ready to sail, requiring all crewmembers and passengersto return on board.
from The American Heritage® Dictionary of the English Language, 4th Edition
[From the fact that it represents the letter P in the International Code of Symbols.]
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