Nouns denoting two and three dimensional shapes

triangle: something approximating the shape of a triangle
spherical polygon: a figure on the surface of a sphere bounded by arcs of 3 or more great circles
regular polygon: a polygon with all sides and all angles equal
obtuse triangle: a triangle that contains an obtuse interior angle
hyperboloid: a quadric surface generated by rotating a hyperbola around its main axis
HA: (astronomy) the angular distance of a celestial point measured westward along the celestial equator from the zenith crossing; the right ascension for an observer at a particular location and time of day
radius: a straight line from the center to the perimeter of a circle (or from the center to the surface of a sphere)
bight: a bend or curve (especially in a coastline)
prism: a polyhedron with two congruent and parallel faces (the bases) and whose lateral faces are parallelograms
catenary: the curve theoretically assumed by a perfectly flexible and inextensible cord of uniform density and cross section hanging freely from two fixed points
figure eight: a two-dimensionsal figure having the shape of the number eight
complex plane: a geometric representation of the complex numbers established by the real axis and the orthogonal imaginary axis; it can be thought of as a modified Cartesian plane, with the real part of a complex number represented by a displacement along the x-axis, and the imaginary part by a displacement along the y-axis
quadrate: a square-shaped object
loop: anything with a round or oval shape (formed by a curve that is closed and does not intersect itself)
Cupid's bow: the double curve of the upper lip when considered to resemble Cupid's bow
knot: something twisted and tight and swollen
ellipsoid: a surface whose plane sections are all ellipses or circles
cleft: a split or indentation in something (as the palate or chin)
scoop: a hollow concave shape made by removing something
S-shape: a double curve resembling the letter S

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