What does PI mean in Chemistry?

This page is about the meanings of the acronym/abbreviation/shorthand PI in the Academic & Science field in general and in the Chemistry terminology in particular.

Phosphate Ion

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What does PI mean?

the ratio of the circumference to the diameter of a circle; approximately equal to 3.14159265358979323846...

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"PI." Abbreviations.com. STANDS4 LLC, 2015. Web. 28 Mar. 2015. <http://www.abbreviations.com/term/267807>.