# Nouns denoting two and three dimensional shapes

- concave polygon
- a polygon such that there is a straight line that cuts it in four or more points

- angularity
- a shape having one or more sharp angles

- bell shape
- the shape of a bell

- rim
- the shape of a raised edge of a more or less circular object

- scoop
- a hollow concave shape made by removing something

- helix angle
- the constant angle at which a helix cuts the elements of a cylinder or cone

- triangle
- something approximating the shape of a triangle

- flexure
- an angular or rounded shape made by folding

- bifurcation
- the place where something divides into two branches

- prismatoid
- a polyhedron whose vertices all lie in one or the other of two parallel planes; the faces that lie in those planes are the bases of the prismatoid

- tree
- a figure that branches from a single root

- striation
- any of a number of tiny parallel grooves such as: the scratches left by a glacier on rocks or the streaks or ridges in muscle tissue

- spheroid
- a shape that is generated by rotating an ellipse around one of its axes

- inclination of an orbit
- (astronomy) the angle between the plane of the orbit and the plane of the ecliptic stated in degrees

- conformation
- a symmetrical arrangement of the parts of a thing

- sphere
- a three-dimensional closed surface such that every point on the surface is equidistant from the center

- line of Saturn
- a crease on the palm; palmists say it indicates how successful you will be

- angular distance
- the angular separation between two objects as perceived by an observer

- wart
- any small rounded protuberance (as on certain plants or animals)

- incision
- a depression scratched or carved into a surface

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