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 In 1870, a "white crown over HK" badge for the Blue Ensign flag was proposed by the Colonial Secretary. The letters "HK" were omitted and the crown became full-colour three years later. It is unclear exactly what the badge looked like during that period of time, but it was unlikely to be the "local scene". It should have been a crown of some sort, which may, or may not, have had the letters "HK" below it. In 1876, the "local scene" badge () was re-adopted to the Blue Ensign flag with the Admiralty's approval. A coat of arms for Hong