"Trigonally" is an adverb that describes things happening or arranged in a triangular pattern. Synonyms for "trigonally" include "triangularly," which also describes something as triangular, and "triangulately," which emphasizes the triangular shape. Another similar word is "triangular," which can be used as both an adjective and a noun to describe something having three straight sides and three angles. Additionally, "trilaterally" can be used to describe something arranged in a triangle with three sides or three points. "Trifurcately" is another possible synonym, which refers to something dividing into three parts or branches.