Details

five equal horizontal bands of red (top, center, and bottom) alternating with white; a blue isosceles triangle based on the hoist side bears a large, white, five-pointed star in the center; the white star symbolizes Puerto Rico; the three sides of the triangle signify the executive, legislative and judicial parts of the government; blue stands for the sky and the coastal waters; red symbolizes the blood shed by warriors, while white represents liberty, victory, and peace

note: design initially influenced by the US flag, but similar to the Cuban flag, with the colors of the bands and triangle reversed