structural:expansion
The national flag of Indonesia is a simple bicolor with two horizontal bands, red (top) and white (bottom) with an overall ratio of 2:3. It was introduced and hoisted in public during the proclamation of independence on 17 August 1945 at 56 Proklamasi Street in Jakarta, and again when the Dutch formally transferred sovereignty on 27 December 1949. The design of the flag has remained unchanged since. The flag of Indonesia is graphically similar to the flag of Monaco, with a slight difference in the shade of red, and ratio of its dimensions. The flag of Poland has similar dimensions but has the colours reversed: white on top and red on the bottom. In both Monaco's and Poland's flags, the reds are of a slightly darker shade than that of Indonesia. The flag of Singapore has the exact same dimensions as Indonesia's, but supplemented with a white crescent moon and five stars in a pentagram at the upper left corner of the flag, of which the red is of a slightly lighter shade. The "Naval Jack of Indonesia" is reserved for sole use by the Indonesian Navy. It flies from the jackstaff of every active Indonesian warship while anchored or moored pierside and on special occasions. The design of the jack is described as nine alternating stripes, consisted of five red and four white stripes. It is nicknamed Sang Saka Merah Putih, lit. 'The Heirloom Red-White'. The naval jack dates to the age of Majapahit Empire. This empire, renowned for its great maritime strength, flew similar jacks on its vessels.