Traffic lights and signs globally contain the color red to denote a stop is needed while traveling in a particular direction. It is one of only four colors that are part of a name of a Sea (the others being Black, White and Yellow Seas).
Red and reddish dyes can be produced from vegetables, the bodies of certain insects, and from minerals such as iron oxide. Ancient Aztecs treated the dye as more valuable as gold or silver, as it took hundreds of people to collect the female cochineal beetle from which it was made.
Biblical meaning of the color red
In the KJV Bible, the word 'red' occurs fifty-three times, six of which are in the New Testament. There are several Hebrew Old Testament words translated as this color. The most frequently used words are adom (Strong's Concordance #H122), which is the color's name, chakliyl (#H2447), which literally means 'dark' or a person stimulated by wine, suph (#H5488 and #H5489), which means 'a reed' and is used to refer to the Red Sea, and adam (#H119), which means to show blood or something that is reddish. In the New Testament, the Greek words used are purrhazo (#G4449), which refers to the color's name, eruthros (#G2063), which is used to refer to the Red Sea, and purrhos (#G4450), which references something that is the color of fire or flame.
The color's use in Scripture lends itself to symbolically meaning sin and sinfulness (Isaiah 1:18), Godly vengeance against sinners (Psalm 75:8, Isaiah 63:2), bloodshed and war (2Kings 3:22, Nahum 2:3, Zechariah 1:8, 6:2, Revelation 6:4, 12:3), as well as the temptation to sin (Proverbs 23:31).
Three prophetic animals
God commanded ancient Israel to use the ashes of a red heifer for the ceremonial cleansing of the tabernacle in the wilderness (Number 19:3 - 6). The New Testament seems to indicate that some sort of altar or temple (with sacrifices?) in Jerusalem will exist in the End Time before the return of Christ (Mark 13:14, Matthew 24:15, 2Thessalonians 2:3 - 4). Some Christians and orthodox Jews believe that any possible future altar or temple-like structure would first need cleansing by the Numbers 19 heifer ashes before its intended use.
The red horse of Revelation 6, symbolizing war and bloodshed, appears when one of the prophetic end time seals is opened (6:1).
The appearance of the great red dragon of Revelation 12, representing the power of Satan and his steadfastness to bring bloodshed and death to all, signals the beginning of the worst time any human will experience (Matthew 24:21).
Sea of death
The Red Sea is a body of water that lies between the African continent (modern Egypt, Sudan, Eritrea, and Djibouti) and the Arabian Peninsula (Saudi Arabia and Yemen). It length is 1,400 miles by a maximum width of about 220 miles, and is the most northern sea on the planet that is tropical. It is unusual in that no rivers flow into it.
Egypt's Pharaoh was angry and foolish enough to chase the fleeing Israelites as they miraculously crossed the Red Sea dry shod. When the last Israelite made it to the other side of the sea, God caused its waters to return to normal, thus drowning Pharaoh's entire army (Exodus 14 and 15).