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The sight setting that will cause a projectile to hit the center of the target with no wind blowing
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The point on a scale from which positive or negative numerical quantities can be measured
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A mathematical element that when added to another number yields the same number
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A quantity of no importance
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Adjust (as by firing under test conditions) the zero of (a gun)
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Adjust (an instrument or device) to zero value
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Of or relating to the null set (a set with no members)
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Indicating the absence of any or all units under consideration
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Having no measurable or otherwise determinable value
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Indicating an initial point or origin