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ground zero - the point of detonation (or above or below) of a nuclear weapon. point - the precise location of something; a spatially limited location; she walked to a point where she could survey the whole street.
Another point of view.. The derivative is set to zero to find the Boundary points. The Boundary could be the Highest Point/Maximum or the Lowest Point/minimum or both the highest and lowest point, a Saddle Point, highest in one direction and lowest in the other direction.