a male given name

jack (nautical: small flag at bow of ship)

a national flag

Taegeukgi, the official flag of South Korea

(maritime) signal flag

autonomous banner (type of administrative division in Inner Mongolia, China)

Rising Sun Flag

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

a land, a large place / a country in general, a region / a country as in a nation, a state