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What does PI stand for?

PI stands for Point of Impact

This definition appears very frequently

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Other Resources:
We have 126 other meanings of PI in our Acronym Attic

Samples in periodicals archive:

It was also surprising how dramatically small changes in the amount of downward pressure affected point of impact.
[ILLUSTRATION OMITTED] The front V-rest does a good job of centering most handgun barrels while the vinyl coating minimizes or eliminates barrel bounce that can affect point of impact.
It also uses the low-vibration, double-rod carbon pendulum, which allows for high rigidity in the impact direction and a high concentration of the mass at the point of impact.