Nouns denoting two and three dimensional shapes
- annulus
- a toroidal shape
- extrados
- the exterior curve of an arch
- pentahedron
- any polyhedron having five plane faces
- angularity
- a shape having one or more sharp angles
- parallelogram
- a quadrilateral whose opposite sides are both parallel and equal in length
- hexagram
- a regular polygon formed by extending each of the sides of a regular hexagon to form two equilateral triangles
- impression
- a concavity in a surface produced by pressing
- dogleg
- angle that resembles the hind leg of a dog
- knife
- any long thin projection that is transient
- prism
- a polyhedron with two congruent and parallel faces (the bases) and whose lateral faces are parallelograms
- pit
- a concavity in a surface (especially an anatomical depression)
- ruck
- an irregular fold in an otherwise even surface (as in cloth)
- S-shape
- a double curve resembling the letter S
- view angle
- the angle included by a photographic lens
- spherical angle
- an angle formed at the intersection of the arcs of two great circles
- angle
- the space between two lines or planes that intersect; the inclination of one line to another; measured in degrees or radians
- bifurcation
- a bifurcating branch (one or both of them)
- complementary angles
- two angles whose sum is a right angle
- spherule
- a small sphere
- convex polyhedron
- a polyhedron any plane section of which is a convex polygon
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