Examples of non polyhedron are
cone
cylinder
spere
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a2x2 + 2abx + b2 where a and b are any integers.
Any closed bounded subset of a metric space is compact.
Lithosphere, Hydrosphere, Atmosphere, Biosphere
It's called a rhombus, and it is any 4-sided shape in which all 4 sides are of equal length. Examples are a square or a diamond.
A quadrilateral is the general term for figures with four sides. A kite, rhombus, trapezoid are all examples of quadrilaterals which need not have any right angles. (A rhombus cannot have any)