The trigram is also related to southwest and the relationship with an eldest daughter.
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Also, the trigram is strongly connected to northeast and the relationship of the Eldest son.
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First they selected a trigram from the K-Book, say YLA.
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The general meaning of this form and associated trigram is Yang, which represents Heaven and Light.
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Also, this trigram has a relationship to South and Father.
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The trigram associated with this pumsae represents Wind.
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The first 3 lines of the hexagram, called the lower trigram, are seen as the inner aspect of the change that is occurring.
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The associated trigram of this pumsae is Yin.
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The receiver set up the start position according to the first trigram, WZA, and decoded the second trigram, UHL, to obtain the SXT message setting.
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More examples
A word that is written with three letters in an alphabetic writing system
Trigrams are a special case of the N-gram, where N is 3. They are often used in natural language processing for doing statistical analysis of texts.
(Trigrams (Eight Trigrams)) symbols of the cycle of yin and yang energy present in all things. Each of the Eight Trigrams consists of three horizontal lines that represent either yin or yang energy. Yang energy is depicted as a continuous line, and yin energy by a broken line. ...
Used to denote a direction, each has a family designation and a characteristic of nature. The trigram symbol is made up of three lines, either solid or broken stacked one upon the other.
A set of three letters considered as a single unit. Examples: ABC, HKX, TOM, VVV.