The equilateral cross is a virtually universal symbol. It was known in Norse culture as a Viking Cross or Odin's Cross. The wheel, more specifically the chariot wheel with six or eight spokes, was an important symbol in historical Celtic polytheism, apparently associated with a specific god, known as the wheel-god, identified as the sky- sun- or thunder-god, whose name is attested as Taranis by Lucan. Numerous Celtic coins also depict such a wheel. It is thought to correspond to a sun-cult practiced in Bronze Age Europe, the wheel representing the sun. In many cultures is symbolizes the union of heaven and earth or the inner and outer worlds of the human psyche. The solar wheel represents the sacred circle of life, its basic four directions, and the elements. Animal totems serve as guardian of each of the directions. Animal totems also serve to link the wearer with his/her spirit guide or totem spirit. It is seen in many religions and belief systems with similar significance. In Wicca and other neo-Pagan religions the sun cross most commonly represents the sun and the four quadrants the wheel of the year, i.e. the four seasonal cycles of the year. In other belief systems the symbolize the union of heaven and earth. In Native American beliefs this is called a medicine wheel.