The seven signs of the Biblical apocalypse, as dictated by the Book of Revelations in the Bible, includes religious deception, war, famine, pestilence, tribulation and martyrdom, signs in the heavens and silence. The seven signs are called the seven seals in Revelations. The first four, characterized by horses with riders, are commonly known as the four horsemen of the apocalypse.
The first seal loosed in Revelations is the white horse, which is commonly understood among Christians to mean religious deception. The second seal is the red horse of war. The third seal is the black horse that causes inflation and thus, famine. The fourth seal is the pale horse allowed to kill through pestilence. The four horsemen are given power over a fourth of the Earth.
The fifth seal is understood to be a strong persecution of Christians. The sixth seal represents signs in the heavens. Some of the signs described include the sun turning black, the moon turning to blood, stars falling from the sky and the sky being rolled back like a scroll.
The seventh seal releases the trumpet and bowl judgments. After this seal is loosed, Revelations depicts heaven as being silent for half an hour. The trumpet judgments get successively worse and the bowl judgments are worse still.