In geometry, a compound of three tetrahedra can be constructed by three tetrahedra rotated by 60 degree turns along an axis of the middle of an edge.
It is a uniform prismatic compound of antiprisms, UC23.
It is similar to the compound of two tetrahedra with 90 degree turns.
It has the same vertex arrangement as the convex hexagonal antiprism.
A subset of edges of this compound polyhedron can generate a compound regular skew polygon, with 3 skew squares.