The national flag of the Philippines (Filipino: Pambansang Watawat ng Pilipinas), also known as Three Stars and a Sun (Filipino: Tatlong Bituin at Isang Araw), is a horizontal bicolor flag 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, to represent the original eight provinces that rebelled against the Spanish during the 1896 Philippine Revolution. In the center of the triangle is a golden-yellow sun with eight primary rays, to represent the original eight provinces that rebelled against the Spanish during the 1896 Philippine Revolution. Three five-pointed stars, one at each of the triangle's points, stand for the three major island groups: Luzon, Visayas (originally referring to Panay Island) and Mindanao. It says the flag's colors commemorate the flag of the United States as a manifestation of gratitude for American aid against the Spanish during the Philippine Revolution.