gnomon, armillary, polyhedron, tetrahedron, sundials, lunette, geometer, astrolabe, retroreflector, zoomorphic, ogee, parabolic mirror, collinear, openwork, octagons, spectroscope, hipparchus, conic, isosceles, pentagonal, zoetrope, celestial sphere, demilune, hyperbolic geometry, equilateral triangle, cartouches, dodecahedron, camera obscura, horsehead nebula, bentwood, theodolite, watchcase, winglike, blackbody, equilateral, polychromatic, ellipsoidal, garniture, chambered nautilus, pediments, quatrefoil, jardiniere, stipple, binnacle, wind vane, semicircles, sextants, yantra, lacelike, stereopticon, cubistic, caryatids, sgraffito, geodesic, hexagram, circlet, metopes, andirons, turtleback, relativity theory, rhombus, pendulums, cuboid, sundog, tycho brahe, rebus, vitrine, newtonian telescope, tympanum, cruciform, magnetic monopole, azimuthal, toroid, corbel, lemon squeezer, quasicrystal, celestial mechanics, escutcheons, quincunx, crenellations, illuminated, lathed, tangram, reredos, dowsing rod, pentagons, daliesque, quoins, isosceles triangle, photomicrograph, polychrome, kufic, fanlike, superstring, electrostatic generator, stereoscopes, edmund halley, faience, reeded, ankh, refracting telescope, embroidery hoop

scientific instrument