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 South Africa of principal elements of the country's flag history. The colours themselves have no essential meaning. The central design of the flag, beginning at the flagpost in a "V" form and flowing into a single horizontal band to the outer edge of the fly. According to official South African government information, the South African flag is "a synopsis of principal elements of the country's flag history." Although different people may attribute personal symbolism to the individual colours or colour combinations, "no universal symbolism should be attached to any of the colours." The only symbolism in the flag is the V or