12. Propello Truncated Cuboctahedron – 22. Propellor Solids Pendant and Keychain - 3D Print File for Geometric Keychain & Pendant - Girl's Fashion Accessories

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Title: 22. Propellor Solids Pendant and Keychain - 3D Print File for Geometric Keychain & Pendant - Girl's Fashion Accessories Family List: 01. Propello Cube 02. Propello Disdyakis Dodecahedron 03. Propello Disdyakis Triacontahedron 04. Propello Dodecahedron 05. Propello Icosahedron 06. Propello Octahedron 07. Propello Pentagonal Icositetrahedron 08. Propello Pentakis Dodecahedron 09. Propello Snub Cube 10. Propello Tetrahedron 11. Propello Tetrakis Hexahedron 12. Propello Truncated Cuboctahedron 13. Propello Truncated Icosahedron 14. Propello Truncated Icosidodecahedron 15. Propello Truncated Octahedron Star Dipyramids and Trapezohedra: Infinite Self-Intersecting Duals of Star Prisms and Antiprisms Star dipyramids and trapezohedra form infinite families of isohedral polyhedra that emerge as duals to uniform star prisms and star antiprisms, featuring self-intersecting triangular or kite-shaped faces derived from dense star polygon bases like pentagrams {5/2} or higher Schläfli symbols. These nonconvex structures preserve face-transitivity and constant dihedral angles, producing dense, interwoven patterns with higher topological density while lacking full polyhedral group symmetries (tetrahedral, octahedral, or icosahedral). Examples include the pentagrammic dipyramid (dual to the pentagrammic prism) with 10 intersecting isosceles triangles, and corresponding star trapezohedra with concave or crossing kite faces, offering a bridge between convex duals and extreme star…