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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