In Hinduism, yellow is used to symbolically represent the third, solar plexus chakra (Manipura). A yellow (turmeric) mark on the forehead used to signify a businessman, or someone of wealth.
When someone says that color is a loud yellow it means that it is a bright yellow. It can mean a lot of different things.
Some say that when your favorite color is yellow, you are a very cheerful person.
a color and obscenity
Multi-vitamins can color a mans semen yellow.
It means the color yellow
the sun
it means they are happy
Yellow (skin)
黄色 (huáng sè) means yellow in Chinese.
Yellow means hug & kiss
If you mean "sky," then it would simply be a description of the sky's color. Yellow is the color between orange and green on the rainbow. You often see a yellowish color to the sky during storms.
If you mean primary color, no green is a secondary color. it is a mixture of yellow and blue.