Logical nor is a boolean logic operator which produces a result that is the inverse of logical or. That is, p nor q is only true when both p and q are false, and is false otherwise.
Nor has the interesting feature that all other logical operators can be expressed by various functions of nor. This is similar to the logical nand operator.
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... inside the groove, the friction between the axis and the groove rims will accelerate or brake the spinning gyroscope, with a maximum effect when the axis starts "rolling" ...