The National Flag of the Philippines (Filipino: Pambansang Watawat ng Pilipinas) is a horizontal flag bicolor with equal bands of royal blue and crimson red, with a white, equilateral triangle at the hoist. In the center of the triangle is a golden-yellow sun with eight primary rays, each representing a Philippine province. [a] At each vertex of the triangle is a five-pointed, golden-yellow star, each of which representing one of the country’s three main island groups—Luzon, Visayas (though originally referring to Panay) and Mindanao. A unique feature of this flag is its usage to indicate a state of war if it is displayed with the red side on top, which is effectively achieved by flipping the flag upside-down.