Simple categories matching symmetric:

• function,
• crystal,
• object,
• shape,
• center,
• space,
• structure,
• pattern,
• material,
• surface,
• interface,
• loop,
• processing,
• system,
• cell,
• figure,
• container,
• polygon,
• pit,
• part,
• phase,
• polyhedron,
• site,
• form,
• window,

Members with property symmetric:

• sphere,
• rib,
• cylinder,
• flat,
• comet,
• crystalline_solid,
• cloud,
• mushroom,
• cube,
• cone,
• optical_fibre,
• bubble,
• disk,
• cap,
• optical_glasses,
• circular_cone,
• ellipse,
• traveling-wave_devices,
• pipe,
• ellipsoid,
• silicon,
• gyroscope,
• prolate_sphere,
• aspherical_surface,
• liquid_surface,
• conical_surface,
• circular_cylinder,
• equilateral,
• space,
• triangle,
• smoke,
• anamorphic_lense,
• circle,
• square,
• star,
• aspheric_surface,
• lampshade,
• hemisphere,
• pen,
• black_hole,
• lithographic_setup,
• spherical_surface,
• biaxial_crystal,
• cylinder_grating,
• right-angle_corner,
• pentagonal_rod,
• moon,
• correlation_function,
• spherical_particle,
• ball_sphere,
• ellipsis,
• round_peg,
• hexagon,
• bottle,
• prism,
• anamorphic_surface,
• rectangle,
• center,
• complex,
• des,
• spheroid_mirror,
• fractal,
• atom,
• tank,
• degeneracy,
• phase_plate,
• turbine_blade,
• vase,
• ball,
• ionic_crystal,
• regular_solid,
• loop_iteration,
• variety,
• ophthalmic_lense,
• bush,
• molecule,
• reentry_vehicle,
• triangle_function,
• liquid_phase,
• bell,
• wall_right,
• round_shape,
• helical_spring,
• symmetric_cone,
• honey,
• gaussian_shape,
• ge,
• crystal,
• octagon,
• ad_space,
• laser_mirror,
• lense_mold,
• coaxial_connector,
• pillar,
• cu,
• car,
• surface,
• glasses,
• truncated_icosahedron,
• holographic_grating,
• direct_approach,
• pentagon,
• hyperbolic_space,
• paraboloid_mirror,
• rectangular_lamina,
• wheel,
• rectangle_window,
• conical_shape,
• supernova_remnant,
• disk_galaxy,
• klystron,
• erythrocyte,
• rectangular_box,
• torus,
• square_tube,
• daisy,
• circular_diaphragm,
• zinc,
• band,
• glass,
• spheroid,
• inert-gas_atom,
• oxygen_site,
• square_structure,
• periodic_solid,
• small_molecule,
• windblown_bubble,
• crescent,
• rna,
• plane,
• character,
• polygon,
• lightbulb,
• circle_fig,
• rectangular_prism,
• oval,
• axle,
• fiber,
• straight_wall,
• face,
• icosahedron,
• isosceles_triangle,
• heptagon,
• finite_cylinder,
• pressure_vessel,
• double_angle,
• u_center,
• parity,
• liquid,
• rectangular_pit,
• grid,
• cup,