There exist no consensus on the meaning of colors on the flag.
Any scientific accepted theory exist about the choice and symbolism of these colors.
Romania
An official explanation of the colors on the flag doesn't exist.
the Australia flag represents the british and the ancient australia
notchu
they signify that armenians are better
3 Colours on a Union Flag
The colours in the Icelandic Flag follow a law set in 1991 which states that the colours must be the following Standard colour of textile.
The colours stand for the three historical provinces of Romania. (Transylvannia , Moldova and Vallahia)
Japan's national colours are the same as the two colours of the Japanese flag - red and white.
red is the traditional Chinese color for good luck!
these are the colours of the Irish flag