The Z semaphore flag. It carried special meaning in the Empire of Japan's navy as a result of the Russo-Japanese War.

(nautical) quarantine flag

Taegeukgi, the official flag of South Korea

steamship

a type of military boat used between the Warring States Period and the Edo Era

a spaceship (vehicle that flies through space, designed to fly with human onboard)

icebreaker (ship designed to break through ice)

patrol boat

shipbuilder, shipwright, a carpenter who builds boats

Kyūjitai form of 船医: doctor on board a ship, ship's doctor