👉 A trihedron is a three-dimensional geometric shape consisting of three congruent, flat triangular faces. These faces are joined at their corners to form a closed figure. The term "trihedral" comes from Greek and refers to the three sides (a triangle) in a trihedron. Trihedra can be classified into different types based on their symmetry, such as regular, irregular, or oblique. Trihedrons can have any number of vertices, but they typically have at least