icosahedral, equilateral triangle, polyhedron, quasicrystal, ellipsoid, dodecahedron, rhombus, pentagons, toroid, isosceles triangle, conic, hexagons, armillary sphere, valence electron, synclinal, spheroids, toroidal, cadmium sulfide, parallelogram, dipolar, ellipse, octagons, torus, semicircles, isosceles, orbitals, covalent bond, soliton, diffraction grating, magnetic monopole, corrugation, strange quark, nebular, hadron, fullerene, rhomboid, blackbody, celestial sphere, dipole moment, stilbene, helices, supersolid, octahedron, chromophore, crystallites, geodesic, lattice, crystal lattice, bilayer, spicule, chondrules, micrometre, buckyball, josephson junction, macromolecule, retroreflector, icosahedron, lunette, agarose, tinkertoy, arcsecond, hyperbolic geometry, birefringence, fibril, magnetic flux, boron nitride, resonant cavity, martensite, dimer, tetramer, cuboid, cube, manganite, supramolecular, micelle, nucleons, buckminsterfullerene, filaments, zns, lamella, gnomon, chirality, exciton, scintillator, punctate, electron volt, chambered nautilus, planetesimal, stalactite, allotrope, diffracting, spectroscope, porphyrin, wavelike, aluminosilicate, planetary nebula, chalcogenide, hydrophobicity, crystallographic, micrograph, peapod, rectangles, hexagon, triangle, polygon, tetrahedra, parallelepiped, rectangle, trapezoid, triangles, pentagon, quadrilateral, prism, cone, diagonal, grid

regular tetrahedron