He suggested our raising the yellow plague flag; and this we did, with a ready response from the quarantine officer.
"The After House" by Mary Roberts Rinehart
From the windmill, where we underwent our quarantine, I could see the tricoloured flag flying on the fortress of Figueras.
"Biographies of Distinguished Scientific Men" by Francois Arago
The yellow flag shows a vessel to be at quarantine or is the sign of a contagious disease.
"The Handy Cyclopedia of Things Worth Knowing" by Joseph Triemens
The yellow quarantine flag, hoisted to prevent communication; whence the term of the yellow flag, and yellow admirals.
"The Sailor's Word-Book" by William Henry Smyth
At her mizzen-peak flew the American ensign, and at the fore-truck the ominous quarantine flag.
"The Tale of Timber Town" by Alfred Grace
This flag is also hoisted on quarantine stations.
"Encyclopaedia Britannica, 11th Edition, Volume 10, Slice 4" by Various