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What does PI stand for?

PI stands for Private Idaho

This definition appears very frequently

See other definitions of PI

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

Samples in periodicals archive:

He then showed his range with more dramatic roles in My Own Private Idaho and Much Ado About Nothing.
And just when you think they couldn't add anything else into the mix, Private Idaho adds a touch of country.