Count Zero, science fiction novel by William Ford Gibson
Ground Zero is the surface point in the vertical of the explosion of a nuclear bomb. This term has also been used figuratively for the area where the World Trade Center of Manhattan was located before the September 11 attacks.
Zeroisation, setting every bit in the data to zero, in computing
In firearms, to "zero" a weapon means to adjust the iron sights or the telescopic sight so that it aims exactly where the bullet goes at a given distance.
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