Remote Online Transaction Processing.
Possibly something 'on the plan'?
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A polygon
A geometrical curve is defined as any set of points. Therefore, counter-intuitively, a straight line is also a geometrical curve.
what is the geometrical shape of equipotential surface due to single isolated charge
A polygon
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.