A square.
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A four-sided polygon may be called a tetragon, quadrilateral, or quadrangle.
an irregular tetragon
A tetragon pyramid, better known as a triangular pyramid, has 4 faces.
A quadrilateral and a tetragon are two possible (correctly spelled) answers.
The popular name is quadrilateral. However, in keeping with Greek prefices, and -gon suffix, it should have been a tetragon.