Quarantine with a disinfecting stove, have a right to navigate the Canal, in quarantine, subject only to the landing of those who were suffering from plague. Plain yellow, green, and even black flags have been used to symbolize disease in both ships and ports, with the color yellow having a longer historical precedent, as a color of marking for houses of infection, previous to its use as a maritime marking color for disease. The present flag used for the purpose is the "Lima" (L) flag, which is a mixture of yellow and black flags previously used. It is sometimes called the
Flag of Saint Helena taken from the colonial seal of the colony. Ships registered in Saint Helena fly the Red Ensign; there is no defaced variant for the territory. Flag of Saint Helena The flag of Saint Helena was adopted on October 4, 1984. It is a defaced (ie. differentiated) Blue Ensign, i.e., a blue field with the Union Jack in the upper hoist-side quadrant and the shield from the coat of arms of Saint Helena centred on the outer half of the flag. The shield features a rocky coastline and three-masted sailing ship, with a Saint Helena plover, also known as a wirebird,