I/O
| Acronym | Definition |
|---|---|
| I/O | Input/Output |
| I/O | Industrial/Organizational (psychology) |
| I/O | Instead Of |
| I/O | In Out |
| I/O | Interoperability |
| I/O | Interest Only |
| I/O | Inboard/Outboard (engine inboard, drive unit outboard) |
| I/O | Insertion Order |
| I/O | Invoice/Order |
| I/O | Instrument Operator (land surveying) |
| I/O | Idiot Operator (as in an I/O error) :-) |
| I/O | Income/Outcome (game) |
| I/O | Innie/Outtie (belly button) |
| I/O | Information Operations Division (Army Software Engineering Center) |