I Ching

A way of casting by using seeds: make three small piles of seeds, then count. Even numbers are yin and are often drawn as your two broken lines. Odd is yang and is drawn as one straight line.
Each set of three makes a tri-gram. You can cast the three piles twice to make your hexagram. Some eastern fortune tellers can do a reading from a tri-gram, although it helps to have two tri-grams. Again, I emphasize this is not the I Ching done with the book we are all familiar with.