👉 Biconical is a type of solid object that has two prisms in its shape. It is characterized by having two parallel planes, each with an axis perpendicular to the other plane and both intersecting at the center of the prism. These two planes are known as the principal planes. Biconcave shapes often occur in the geometry of solids like spheres, cones, cylinders, pyramids, prisms, etc., as well as in the geometry of surfaces like cylinders, cones, and py