# Nouns denoting two and three dimensional shapes

- convex polygon
- a polygon such that no side extended cuts any other side or vertex; it can be cut by a straight line in at most two points

- truncated pyramid
- a frustum formed from a pyramid

- perpendicular
- a straight line at right angles to another line

- join
- the shape or manner in which things come together and a connection is made

- recess
- a small concavity

- angle of extinction
- the angle from its axis that a crystal must be rotated before appearing maximally dark when viewed in polarized light

- ovoid
- an egg-shaped object

- natural shape
- a shape created by natural forces; not man-made

- centerline
- a line that bisects a plane figure

- knife
- any long thin projection that is transient

- toroid
- the doughnut-shaped object enclosed by a torus

- stemma
- a tree diagram showing a reconstruction of the transmission of manuscripts of a literary work

- crenature
- one of a series of rounded projections (or the notches between them) formed by curves along an edge (as the edge of a leaf or piece of cloth or the margin of a shell or a shriveled red blood cell observed in a hypertonic solution etc.)

- sector
- a plane figure bounded by two radii and the included arc of a circle

- view angle
- the angle included by a photographic lens

- hoodoo
- (geology) a column of weathered and unusually shaped rock

- torsion
- a tortuous and twisted shape or position

- arc
- a continuous portion of a circle

- AZ
- the azimuth of a celestial body is the angle between the vertical plane containing it and the plane of the meridian

- balance
- equality of distribution

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