Which of the following shapes....?
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Of you're only talking about quadrilaterals then it comes down to squares and rectangles.
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polygons are 2 dimensional shapes. they must have all straight sides and they must be closed. some examples are squares triangles, etc.  circles aren't because they  have 1 curved side.\n\npolyhedrons are 3-d shapes that have all flat sides and have no openings. ex: cube. spheres, cones, and cylinders are not because they all have curved sides.
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What kind of a symbol?
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oblique, obilisque shape
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A sphere\n\nA circle is a two dimensional (flat) shape.\n\nA rugby football is an ovoid - as is an American Football football.
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There are many crystal shapes.  The standard is an elongated six sided coming to a pyramid like point at the top.  Some, however, are double terminated (have points at both ends). Some (such as garnets) have six sides, but are flat on top and almost roundish looking.  Others, such a mica, are in flat layers.  Others still, can come in cubes (such as pyrite)  Some crystals have no particular shape at all (globular)(such as malachite).  So there is no one particular crystal shape.
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Only one I can think of is the Palm Heart. It is the unexpanded vegetative apex that is vaguely heart shaped.
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sphere, cube, pyramid, cilinder
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Here's my answer:\n\nhttp://mudandmuck.com/str2/triangles.JPG\n\nYou didn't say write them out in English, you said describe.  This picture describes the solution.
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number of sides, congurency?, size of angles, distinguishing characteristics
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You are referring to locus/parametrics. The shape you are referring to in relation of a locus of a point and a line, is a PARABOLA. It looks like an curve/hill kinda thing.
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a donut!!!! it's round...so no beginning or end, and there isn't a middle LOL!!
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A circle with a cross within it.\nRefer to: http://www.earth.uni.edu/~morgan/astro/course/Notes/section4/new17.html
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circular segment\n\nhttp://en.wikipedia.org/wiki/Circular_segment
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shape/morphology\ngram pos or gram neg\npresence of capsules (or not)
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There are in infinate number of 2d shapes, but here are diagrams of some of them --> http://www.mathleague.com/help/geometry/polygons.htm
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your question is not clear. describe positions of the objects.