Each planetary glyph is made up of one, or a combination, of the following: a circle for Spirit; a cross (or form of) for Matter; and a cresent for the Soul or Psyche. The glyphs can be seen on astro.com.
People often wonder where Earth is represented on the chart. The symbol for Earth is a circle divided into four quadrants (in other words, a cross surrounded by a circle). Since everything in astrology is viewed from our perspective on Earth, the starting point for a chart is a circle divided into four quadrants.