Tetrasnub antipodic disdecachoron

The tetrasnub antipodic disdecachoron, or tesapdid, is a nonconvex uniform polychoron that consists of 10 icosahedra, 10 great icosahedra, 40+120 octahedra, and 60+120+120 tetrahedra. 1 icosahedron, 1 great icosahedron, 8 octahedra, and 10 tetrahedra join at each vertex.

This polychoron has ionic decachoric symmetry, with the icosahedra and great icosahedra acting as snub tetrahedra and retrosnub tetrahedra. With all of its cells geometrically regular, it can be considered a semiregular polychoron.

It was discovered on October 17, 2021.