Trigrammic refers to a word or an expression that consists of three letters or syllables. Some synonyms for trigrammic can include: triad, triplet, ternary, triplicate, treble, threefold, thrice, and tripartite. These words are often used to describe patterns, structures, or ideas that revolve around the number three. Trigrammic words are commonly used in various fields such as linguistics, computer programming, and cryptography. They can also be used in literature, poetry, and music to create rhythmic patterns or repetitions. Overall, the synonyms of trigrammic serve as helpful descriptors in conveying the meaning and significance of words or expressions that are composed of three parts.