High Quality Content by WIKIPEDIA articles! In geometry, the triaugmented triangular prism is one of the Johnson solids (J51). As the name suggests, it can be constructed by augmenting a triangular prism by attaching square pyramids (J1) to each of its three equatorial faces. It is a deltahedron. The 92 Johnson solids were named and described by Norman Johnson in 1966. The dual of the triaugmented triangular prism is an order-5 associahedron. This transparent image shows its three square, and six congruent irregular pentagonal faces. Edges are colored to distinguish the 3 different edge lengths.