I Ching (pronounced yee jing) is translated as The Book of Change. I Ching has a long history, dating back to 3,000 BC when writing began in China according to Wu Wei in the book titled The I Ching The Book of Changes and How To Use It.
The I Ching system consists of sixty-four hexagrams. Each hexagram has six lines stacked one above the other. A line is either divided (- -) or undivided. The hexagrams are formed by combining two trigrams consisting of three lines each.
There are 4,096 possible combinations of lines. The Chinese sage Fu Hsi is credited with constructing answers using the sixty-four hexagrams. To consult the I Chin, a question is carefully formulated, then three coins are tossed (some practitioners use yarrow stalks instead of coins.)
For our purposes we will continue with the coin example. Depending on the pattern of the coins (head/tail) lines are constructed from the bottom to the top of the hexagram. The resultant hexagram is then interpreted as an answer to the question.
If you would like to know more, there are a number of books available. Some to consider are: The I Ching The Book of Changes and How To Use It by Wu Wei,
The I Ching or Book of Changes A guide to Life’s Turning Points by Brian Browne Walker,
or I Ching in Ten Minutes by R. T. Kaser.