Truncated tetrahedron
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In geometry, the truncated tetrahedron is an Archimedean solid. It has 4 regular hexagonal faces, 4 equilateral triangle faces, 12 vertices and 18 edges. It can be constructed by truncating all 4 vertices of a regular tetrahedron at one third of... Wikipedia
Dihedral angle: 3-6: 109°28′16″; 6-6: 70°31′44″
Faces by sides: 4+4
Rotation group: T,+, (332), order 12
Schläfli symbols: t= h2
Symmetry group: Td, A3,, (*332), order 24
Wythoff symbol: 2 3 | 3