Signal flag "Lima"

Signal flag "Lima" (called the "Yellow Jack") indicating a ship is under quarantine

Signal flag "Lima" called the "Yellow Jack" which when flown in harbor means ship is under quarantine

Quarantine is compulsory isolation, typically to contain the spread of something considered dangerous, often but not always disease. The word comes from the Italian (seventeenth century Venetian) quarantena, meaning forty-day period. Quarantine can be applied to humans, but also to animals of various kinds.

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