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 Ottawa appearance. It also violated rules of heraldry by placing colour next to colour. In 1987, in an attempt to spruce it up, the city's coat of arms was added to the centre. There was little controversy when the transition board decided the new city should get a new flag. Flag of Ottawa The flag of Ottawa is highlighted by a stylized O design. This stylized O is meant to represent both a maple leaf (symbolizing Canada) and the Peace Tower and Centre Block of the parliament buildings (symbolizing Ottawa). It is meant to be simple, but look festive, and to