# Nouns denoting two and three dimensional shapes

- regular hexahedron
- a hexahedron with six equal squares as faces

- two-dimensional figure
- a two-dimensional shape

- lead
- the angle between the direction a gun is aimed and the position of a moving target (correcting for the flight time of the missile)

- equiangular triangle
- a three-sided regular polygon

- pentagon
- a five-sided polygon

- pentacle
- a star with 5 points; formed by 5 straight lines between the vertices of a pentagon and enclosing another pentagon

- flank
- a subfigure consisting of a side of something

- twist
- a circular segment of a curve

- frown line
- a facial wrinkle associated with frowning

- crack
- a long narrow depression in a surface

- figure
- a combination of points and lines and planes that form a visible palpable shape

- circle
- something approximating the shape of a circle

- hexagon
- a six-sided polygon

- convex polyhedron
- a polyhedron any plane section of which is a convex polygon

- caput
- a headlike protuberance on an organ or structure

- love line
- a crease on the palm; palmists say it indicates your emotional nature

- bottleneck
- a narrowing that reduces the flow through a channel

- tesseract
- the four-dimensional analogue of a cube

- chord
- a straight line connecting two points on a curve

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

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