The Nautical Encyclopedia

Patterson’s Illustrated Nautical Encyclopedia — Howard Patterson, 1891

⚓ The Superstition Locker ⚓

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Home ⚓ Letter Y ⚓ Yellow Jack

Yellow Jack

Sea Terms

The yellow quarantine flag flown by a vessel having contagious disease on board.

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The Nautical Encyclopedia (1891) is in the public domain; this digital edition © 2026 PhotoOpAI.