Flags flown by ships are also called ensigns.
Jack
The Union Jack is the flag flown at the bow of a Royal Navy ship. The Union Flag is the flag of Great Britain.
The Papa flag
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A yellow flag flown on a ship indicates that there is disease onboard. It also the signal flag for the letter 'Q'.
ensign
It is correctly called the Union Flag, and only the Union Jack when it is flown on a ship, the flag would be hoisted up a ships 'jackstay' a rope which runs up the main ships mast, hence the name Union Jack. Most British citizens offhandedly call it the "Union Jack" though, in much the same way Americans call their flag "Old Glory". They called it the old glory because it is old.
The jack is the spar pole on the bow of a ship, where the Union Jack or other Jack (a type of flag is flown).
what are cruise ship officers called
The word is pennant. It means a flag that denotes a sports achievement or a tapering flag flown on a ship.
Ensign O'Toole. The ensign is usually the largest flag, flown at the back, or stern, of a ship.
The Union Jack is so called because it is the Union Flag flown from a jack staff of a ship. If the flag is flown anywhere else it is properly called the Union Flag. The word "Union" refers to the uniting of England, Scotland, Wales, and Northern Ireland to form the United Kingdom.