Phobos and Deimos A sign for Ares, the god of aggression, violence, war and devastation in ancient Greece. Ares had the children Deimos and Phobos (Horror and Fear) and their sister Eris (Discord). For this reason the two small moons of the planet Mars were named Phobos and Deimos. Ares was later given the name Mars by the Romans.

Phi Phi is the twenty-first letter of the Greek alphabet. It is one of the letters in the Danish and Norwegian alphabets, signifying a vowel sounding like a combination of the u in fur, and the oo in foot. In computer notation it is the common sign for zero. In the mathematical theory of sets it means the empty set.
As a biological sign it has been used to signify a dead female (a combination of for nullified or cancelled, and for female).

Chi Is the twenty-first letter of the Greek alphabet. As an Egyptian hieroglyph it meant to damage, divide, count, or break into parts.

Mnemosyne Mnemosyne is the personification of memory and its goddess. She is a daughter of Gaia and Uranus and the mother of the nine Muses by Zeus, her nephew.

Lethe "Forgetfulness". In Greek mythology, the Lethe is one of the rivers that flow through the realm of Hades. Called the River of Oblivion, the shades of the dead had to drink from this river to forget about their past lives on earth.

Siren The Sirens were sea-nymphs who had the power of charming by their song all who heard them, so that the unhappy mariners were irresistibly impelled to cast themselves into the sea to their destruction. Is the latin word for Mermaid

Chaos Chaos is the void which came into being before anything else. But some say that Chaos was born from Mist and that Mist was the first to exist. Others say that Chaos is not a void but a rough unordered mass of things. It is also said that Chaos existed from the beginning together with Nyx, Erebus (Darkness of the Underworld) and Tartarus and that is why some consider Chaos to be as Nyx and Erebus: one of "the powers below the ground".