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 Vendsyssel Flag of Vendsyssel The proposed flag of Vendsyssel in Denmark was introduced by the mayor of Hjørring in 1976, and is used to some extent. The flag is named Vendelbrog (with reference to the Danish flag Dannebrog interpreted as The Danish cloth). It is a Nordic Cross flag in blue, orange and green. The blue colour symbolizes the sea. The orange/red colour is symbol of the sun and the beaches of Vendsyssel, and the green is for the lush nature. By tradition, only people born in Vendsyssel can use the flag. The flag is not officially recognised, but it used