When three broken/unbroken lines are arranged one on top of another, eight different diagrams are formed. Each is called a trigram. Each of the lines forming the trigram is called a yao. The yaos are counted from bottom to top.

Each trigram is also called a gua. The eight trigrams together form a Ba Gua (the Eight Trigrams). They were arranged in the following way called the Xian Tian Ba Gua according to Fu Xi.

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