Symbols used in astrology overlap with those used in astronomy because of the historical overlap between the two subjects. Frequently used symbols include signs of the zodiac and for the classical planets. These have their origin in medieval Byzantiny, but in their current form are a product of the European Renaissance. Other symbols for astrological aspects are used in various astrological traditions.
The glyphs of the planets are usually (but not always) broken down into four common elements: A circle denoting spirit, a crescent denoting the mind, a cross denoting practical/physical matter and an arrow denoting action or direction.
The Hamburg School of Astrology, also called Uranian Astrology, is a sub-variety of western astrology. It adds eight hypothetical trans-Neptunian planets to the normal ones used by western astrologers: