a blue flag with a white square in the center, designating the letter P in the International Code of Signals, flown by a vessel in port to indicate its imminent departure.
Historical Examples

Tales Of The Trains Charles James Lever
The Flag of Distress Mayne Reid
Nick Baba’s Last Drink and Other Sketches George P. Goff

a signal flag of blue with a white square at the centre, displayed by a vessel about to leave port


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