The Collaborative International Dictionary
Trigrammatic
Trigrammatic \Tri`gram*mat"ic\, a. [Gr. ?; ? + ? a letter.] Containing three letters or characters, or three sets of letters or characters.
Wiktionary
trigrammatic
a. Containing three letters or characters, or three sets of letters or characters.
Usage examples of "trigrammatic".
I will assist you across the Plain of Standing Stones, At the first opportunity take up a pebble the size of your fist and make the trigrammatic sign upon it.
Sarsen he exchanged stones as Erwig had recommended, and this time he made the trigrammatic sign with care and precision.
All possible trigrammatic permutations of the two produced eight figures.