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 Norway and Finnmark, the flag is flown between 10.00 and 15.00 from November to February. These rules do not apply for private use of the flag, but they are generally observed by all citizens. There also exist written rules for the proper folding of the flag, for not letting it touch the ground, and in addition the unwritten rule that it should not be worn on the body below the waist. The proportions of the national flag are 22:16 (width to length), its colour elements having widths of 6:1:2:1:12 and lengths of 6:1:2:1:6. The proportions of the state flag are 27:16,