Gyroelongated pentagonal pyramid

In geometry, the gyroelongated pentagonal pyramid is one of the Johnson solids (J₁₁). As its name suggests, it is formed by taking a pentagonal pyramid and "gyroelongating" it, which in this case involves joining a pentagonal antiprism to its base. It can also be seen as an icosahedron with the top (a pentagonal pyramid, J₂) chopped off by a plane.

The 92 Johnson solids were named and described by Norman Johnson in 1966.