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 Ontario the Canadian Red Ensign, which had been the "de facto" national flag of Canada since 1867. The flag is a red field with the Royal Union Flag in the canton and the Ontario shield of arms in the fly. The coat of arms of Ontario had been previously granted by Royal Warrant of Queen Victoria in 1868. It features a green field with three gold maple leaves and above it, a white band with a red St. George's cross. The specifications of the flag are 1:2. The shade of red in the flag is specified as "British Admiralty Colour Code