rainbow

rainbow often taken as a symbol of hope or a promise for peace, traditionally with allusion to Genesis 9:13–16, referring to God's setting a rainbow in the sky as a sign of his covenant with his chosen people (see also bow of promise). It may also more generally be a sign of something distant and (perhaps) unattainable, as in the song ‘Over the Rainbow’ (1939) by E. Y. ( ‘Yip’) Harburg.
at the end of the rainbow referring to something much sought after but impossible to attain, with allusion to the story of a crock of gold supposedly to be found by anyone reaching the end of a rainbow.
Rainbow Bridge a bridge of natural rock, the world's largest natural bridge, situated in southern Utah, just north of the border with Arizona. Its span is 86 m (278 ft).
rainbow coalition a political alliance of differing groups, typically one comprising minority peoples and other disadvantaged groups; a phrase originally coined by the American minister and Democratic politician Jesse Jackson in a speech of 1988, ‘When I look out at this convention, I see the face of America, red, yellow, brown, black, and white. We are all precious in God's sight—the real rainbow coalition.’
rainbow serpent a widely venerated spirit of Australian Aboriginal mythology, a large snake associated with water.
Rainbow Warrior the name of a ship belonging to Greenpeace which in 1985 was sunk in Auckland harbour after two bomb explosions; it had been about to sail for Mororua Atoll to protest against French nuclear testing there, and it was subsequently revealed that French intelligence agents had planted the bombs. The French Minister of Defence resigned as a result, and the head of the intelligence service was dismissed.