What does io stand for?

Infinitely Often

This definition appears very rarely and is found in the following Acronym Finder categories:

Science, medicine, engineering, etc.

Other Resources:

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In Organization (banking) Inboard Outboard (boat drive system) Independent Observations Indian Ocean Indian Orchard (Springfield, MA) Indirect Object Individually Optimum Industrial Operations Industrial-Organizational (Psychology) Inexperienced Operator		Information Object Information Officer Information Operations Information Orientation Information Outlet (LAN) Information Output Information Overload Infrastructure Optimization Initial Only Input Operator

Samples in periodicals archive:

Hence the ever increasing number of independently moving particles might cause bounded neighborhoods of 0 be visited infinitely often if the cloud is growing fast enough.

A note on the transience of critical branching random walks on the ...

It is not even known that all digits appear infinitely often," Wagon remarks.

Pi a la Mode

However, no one knows whether all of the digits from 0 to 9 appear infinitely often in this expansion or whether one-tenth of the digits are ones, and so on.

Pi wars: dueling with supercomputers