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 Hong Kong overseas, the flag is displayed during days when these offices are working. Other government offices and buildings, such as hospitals, schools, departmental headquarters, sports grounds, and cultural venues should fly the flag on occasions such as the National Day of the PRC (1 October), the Hong Kong Special Administrative Region Establishment Day (1 July), and New Year's Day. The flag should be raised at 8:00 a.m. and lowered at 6:00 p.m. The raising and lowering of the flag should be done slowly; it must reach the peak of the flag staff when it is raised, and it may not touch