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What does OI stand for?

OI stands for Opening Instructions

This definition appears somewhat frequently

See other definitions of OI

Other Resources:
We have 18 other meanings of OI in our Acronym Attic

Samples in periodicals archive:

At the same time, the closures' ribbed outer-edge protrusions provide a unique in-hand experience that, when combined with the caps' clear opening instructions and pictograms, offers simplicity and comfort.