For the ancient Romans, a red flag was a signal for battle.
Because of its visibility, stop signs, stoplights, brake lights, and fire equipment are all painted red.
In Russia, red means beautiful. The Bolsheviks used a red flag as their symbol when they overthrew the tsar in 1917. That is how red became the color of communism.
In India, red is the symbol for a soldier.
In South Africa, red is the color of mourning.
It's considered good luck to tie a red bow on a new car.
In China, red is the color of good luck and is used as a holiday and wedding color. Chinese babies are given their names at a red-egg ceremony.
A “red-letter day” is one of special importance and good fortune.
In Greece, eggs are dyed red for good luck at Easter time.
Red is the color most commonly found in national flags.
A “red herring” is a distraction, something that takes attention away from the real issue.
A “red eye” is an overnight airplane flight.
If a business is “in the red,” it is losing money.