trigram

/ˈtraɪɡræm/
noun
  1. A group of three letters, especially one used as a unit in cryptography or linguistics.
    • The cryptographer analyzed trigram frequencies to break the code.
    • Linguists study trigrams to understand common letter patterns in a language.
    • In English, the trigram 'the' appears very frequently in texts.
  2. A symbol consisting of three lines, especially in the I Ching (an ancient Chinese text), where each trigram represents a natural force or concept.
    • She consulted the I Ching and drew a trigram that symbolized water.
    • The trigram for heaven consists of three solid lines.
    • Each hexagram in the I Ching is made up of two trigrams.
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