A monogram or wenzel ( Polish: Węzeł, "knot") is a motif made by overlapping or combining two or more letters or other graphemes to form one symbol. Monograms are often made by combining the initials of an individual or a company, used as recognizable symbols or logos.
I think it might be tetradic but i’m not certain. i hope this is at least slightly helpful but i’m sorry if it’s not