A rainbow is an optical and meteorological phenomenon that causes a spectrum of light to appear in the sky when the Sun shines on to droplets of moisture in the Earth ...

http://en.wikipedia.org/wiki/Secondary_rainbow

A rainbow is a meteorological phenomenon that appears as a multicolored arc that forms with the sunlight Rainbow may also refer to: Rainbow, Victoria, Australia ...

http://en.wikipedia.org/wiki/Rainbow_(disambiguation)

"A" is a song by South Korean girl group Rainbow. The song was released on August 12, 2010, and was later included on their second mini album So Girls. A teaser photo ...

http://en.wikipedia.org/wiki/A_(Rainbow_song)