Quarantine "yellow jack" but this was also a name for yellow fever, which probably derives its common name from the flag, not the color of the victims (cholera ships also used a yellow flag). The plain yellow flag ("Quebec" or Q in international maritime signal flags) probably derives its letter symbol for its initial use in "quarantine", but this flag in modern times indicates the opposite—a ship that declares itself free of quarantinable disease, and requests boarding and routine port inspection. Australia has perhaps the world's strictest quarantine standards. Quarantine in northern Australia is important because of its proximity to South-east
Flag of Poland trade union logo. The following organs are required by law to fly the national flag without coat of arms either on top or in front of their official buildings: Additionally, the national flag without coat of arms is used as an ensign for inland navigation. While the ban on using the flag without coat of arms has been lifted, the use of the national flag with coat of arms is still legally restricted and should be flown only: In practice, however, the restriction is often ignored and the two flags, with and without the coat of arms, are treated as