👉 In mathematics, "chetrums" are a type of figurate shape used in combinatorics and graph theory. They are also known as triangular arrays or triangles in computer science terminology. A chetrum (or triangle) is a grid-like structure where each cell can contain one of four values: 0, 1, 2, or 3. The cells are arranged in a grid pattern that resembles the shape of a triangle, with the top row being the smallest, and