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 Sweden used from a flagpole extending from a building, the flag is recommended to have a width equaling a third of the height (length) of the pole. It is further recommended to fly the flag only during daytime, and to lower it no later than 9 pm. Only when the country is at war is it recommended to fly the flag also at night. The king and queen use a royal flag with the greater national coat of arms. Other members of the royal house use a royal flag with the lesser national coat of arms. On naval ships the flag