That would either be a quadrilateral (2-Dimensional) or a tetrahedron (3-Dimensional)
Note that the meaning of "side" is a bit different depending on whether you are talking 2-D or 3-D.
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The name of a four sided figure (or shape) is called a Square. :)
A pyramid is a four-sided, three-dimensional figure.
A four sided figure with no parallel sides is a trapezium, but it is also an irregular four-sided polygon, tetragon, quadrilateral, or quadrangle.
A decagon - if the sides are all equal, and the angles are all equal, it is a regular decagon.
Square.