Ancient Chinese system of divination. The system contains eight blocks of short or long lines, forming 64 hexagrams, that can be combined to give 11,520 situations, deployed in a manner analogical to astrology to make predictions. Also, the name refers to the book explaining the system.

http://www.iging.com/intro/foreword.htm An introduction to the I ching (by C. G. Jung)

http://members.iinet.net.au/~saandss/chinesephilosophy/zajia.html#yijing A list of internet resources on the I ching