IO
From Fresh Dictionary
See also io{{#if:Io|{{#if:Ñ|,|, and}} Io{{#if:Ñ|{{#if:Ю|,|, and}} Ñ{{#if:Ю|{{#if:|,|, and}} Ю{{#if:|{{#if:|,|, and}} [[{{{5}}}]]{{#if:|{{#if:|,|, and}} [[{{{6}}}]]{{#if:|{{#if:|,|, and}} [[{{{7}}}]]{{#if:|{{#if:|,|, and}} [[{{{8}}}]]{{#if:|, and [[{{{9}}}]]}}}}}}}}}}}}}}}}
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English
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Initialism
IO (or I/O)