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 pole. When lowering the flag from half-mast, it should first be raised to the peak of the pole before it is lowered. The Regional Flag and Regional Emblem Ordinance states what manner of use of the Hong Kong flag is prohibited and that desecration of the flag is prohibited; it also states that it is a punishable offence for a person to use the flag in a prohibited manner or desecrate the flag. According to the ordinance, a flag may not be used in advertisements or trademarks, and that "publicly and wilfully burning, mutilating, scrawling on, defiling or trampling" the