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pratical service.
A minimum value (of any function, not just a polynomial) is a value that has a lower value than any nearby value. A global minimum is a value that is lower than ANY other value. (This answer is just a brief and informal overview; check the Wikipedia article on "maxima and minima" for a more detailed explanation.)
The absolute value of zero is zero. The absolute value of any other real number - or even of any other complex number - is different from zero.
Seems to us that any value at all can be squared.
It indicates the value zero in any base.